Please remember comments get comments so comment on my drawing if you haven't. I'll start. These are so cute lol. They remind me of those origami cubes you would fold and then blow into an puff up. Oh yeah, they also remind me of jigglypuff...you should make one of her!!!!!
Well, basically you just make the pattern on a piece of paper then fold it to make it 3D, for example like cube, you can make the pattern of cube in a piece of paper and fold it to be a 3D cube. Just like this [link]