Get a bunch of paper
. A notebook might be good to take out paper. Take a sheet of paper and put it in some water. Make sure you get it really wet.
Slowly take out some water while mashing up the paper
. Eventually you should have a ball of wet paper that has the consistency of Play Dough. If you don't, add or take out some water so the paper can absorb it and break up even more.
Lay it down on a plate or tray so you can make the small house and put it out in the sun later
. Keep making little lines out of more wet paper. Eventually you should have about 3 lines that make a square that's missing one side, or at least a piece of a side.
After each corner has a line on it, start mixing more "Play Dough" and instead of making more lines, just make them into little blocks or flat blocks, these will be your walls
. Put them on the vertical lines until you have a cube that's missing 2 faces (top and one of the sides)