Take a square paper with color on both the sides.
Fold the paper into half joining the two parallel sides.
Open it and fold both the ends up to the crease in the center.
Open the fold and you can see four parallel lines on the paper.
Curve one corner of the paper till the fist line crease.
Do the same with the opposite corner of the paper.
Fold both the sides of the turned paper as it did before.
Take the right hand side top corner point and fold it diagonally.
You will get a crease here. Open the fold and tuck the upper flap inside.
Turn the object and do the same with it carefully.
Flip the object and fold it as the top corner coming down and making an equilateral triangle.
Do the same with the other top corner too.
Now open the turns and you will get creases on the sides.
Similarly make six parts like this with six papers.
Then take two objects and tuck one corner into another properly.
Take the third object and tuck it over the second one as shown in the illustration.
Similarly tuck the objects in each other accordingly making a cube.
And your cube is ready.