We had one day and one cardboard box to make two costumes for our Halloween party! What would you make?

Here’s what I came up with: LEGO bricks! We had pretty much everything we needed to make these so it cost us just our time. And we managed to finish them the day of our party! I’m really happy with how they turned out and our guests loved them!

Two adults dressed in LEGO brick costumes, one yellow and one blue, holding LEGO flowers in a home setting.
Lego block costumes!

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Here’s what you need to make 2 LEGO brick adult sized costumes:

STEP 1: Flatten the cardboard box and lay it down somewhere you can cut it. Cut it in half vertically with a box cutter in the middle of the biggest side.

Person holding a large cardboard box labeled 'EXTRA LARGE' while sitting on a tiled floor, with a ruler and a pet nearby.
Cut the box in half

After you make the first cut, unfold it and cut the same panel on the opposite side in half, exactly the same way.

Two people working together on a large cardboard box on the floor, measuring and marking it with a tape measure and ruler in a cozy indoor setting.

Two people measuring and cutting an extra large cardboard box on the floor, with a dog resting in the background.
Cut the other side

You will have two identical boxes with flaps on the top and bottom and open on the back side.

Two people working on cardboard boxes in a living room, one is holding a half-cut box while the other is holding a whole box.

STEP 2: Glue down the flaps on the top only. Leave the bottom ones free. This will make it easier to walk and sit down.

Two people actively working on a cardboard box, one applying glue with a hot glue gun while the other holds the box steady.

STEP 3: Cut a hole in the top for your head on the top side where you glued the flaps down.

A person holding a piece of cardboard with a cut-out hole for their head, preparing to create a costume, in a domestic setting.
Cut a hole in the top

STEP 4: Put the box over your head and have a friend draw where the arm holes should be on both sides.

A person wearing a cardboard box costume stands with their arms outstretched while another person uses a marker to draw on the box for armhole markings. The scene is indoors with art on the walls.
Draw arm holes

STEP 5: Cut out the arm holes with the box cutter.

Person wearing a cardboard LEGO brick costume with arm holes, standing indoors.
Arm holes cut

STEP 6: Cut the concrete tube into 2″ rounds with the hand saw so you have 12 in total (6 for each box).

A person holding a concrete form tube, standing in a room with cardboard boxes and a chair in the background.
Concrete form tube

One tube is plenty to cut all 12 rounds. I happened to have this concrete form leftover from another project which worked out perfectly! I love when I save things and they end up coming in handy, don’t you?

A person holding a concrete form tube in a living room, with a cardboard box and other crafting materials visible in the background.
Cut 2″ rounds
A person using a hand saw to cut a cardboard concrete form tube for a DIY LEGO costume, with various crafting tools and circular card stock pieces visible in the background.
Cut 2″ rounds with the hand saw

STEP 7: Trace the rounds on card stock with a Sharpie and cut out 12 circles. Make sure you cut outside of the drawn line so that it will overlap the circle and you can glue it down.

A person is kneeling on the floor, tracing a circular shape onto a piece of card stock. Several pre-cut circular cardboard pieces are arranged nearby.
Trace the circles
A person cutting cardboard shapes on the floor, surrounded by various cutouts and circular cardboard pieces. A hot glue gun and a tumbler are also visible in the workspace.
Cut out the circles

STEP 8: Glue the 12 card stock circles onto the 12 concrete tube rounds.

A person holding several round cardboard cutouts, smiling, with a backdrop of a living room featuring a potted plant and a piece of cardboard box.
All the rounds cut!
A person using a hot glue gun to attach cardboard circles for a DIY project, with additional cardboard pieces visible on a tiled floor.
Hot glue the circles to the rounds
A person using a hot glue gun to attach a cardboard circle to the top of a cut cardboard form tube, with multiple cut circles visible in the background.
Glue the circles on the rounds

STEP 9: Glue the buttons onto the box with the hot glue gun. I did 6 buttons on each box. By the way, having a good hot glue gun makes all the difference! I had a crappy one for a long time and upgraded to this one and it is elite! What a game changer!

A person cutting circular cardboard shapes for LEGO brick costumes from a cardboard base using a box cutter.
Glue the buttons down
Flat cardboard sheet with six round cutouts for creating LEGO brick costume buttons.
One brick down

STEP 10: Spray paint! Note: the yellow spray paint did not cover well with the first coat. I either should have primed it first or picked another color. Red would have worked better I think. The blue covered great! The yellow needed a second coat and I ended up having to buy another can of spray paint which was a bummer.

Person holding yellow and blue spray paint cans, wearing a black tank top and glasses, with a garden backdrop.
A person spray painting a cardboard box designed to resemble a LEGO brick, with concrete form tube rounds placed on top. The background features greenery and a wooden fence.
A person wearing safety goggles and a respirator mask is spray painting circular pieces of cardboard blue, while standing next to a cardboard box on a covered surface.
A person wearing safety glasses and a respirator mask, holding a can of yellow spray paint while standing near cardboard pieces and a blue plastic sheet.
A person wearing safety glasses and a respirator mask spray paints cardboard circles yellow while working on a LEGO-themed costume.

STEP 11: Let them dry for a few hours and you’re done!

Two adults dressed as LEGO bricks, one in blue and the other in yellow, standing in a living room. The man holds a bouquet of flowers, while both are smiling and posing playfully.

These would make really cute costumes for kids too, with a smaller box of course. You could have an entire LEGO family with all different colors!

This was a fun project, super easy and cost under $20! We literally made these the day of our Halloween party and they came out great! Bonus if you have the LEGO flowers which makes a really cute prop! We happened to have these already too!

It was also hilarious that we “fit” together just like LEGO bricks! So funny!

A man and a woman dressed as LEGO bricks for Halloween, standing side by side in a cozy living room, with a TV and decorative items in the background.
We really click

Let me know if you try this or if you have any other ideas for easy costumes you can make out of one cardboard box!

Happy Halloween!

Until next time,

Happy DIY-ing!

-Selene

A couple dressed in homemade LEGO brick costumes, one blue and one yellow, standing close together and sharing a playful moment indoors.
Lego couples costume

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