This is a simple and useful model, I use it all the time for pencil sharpenings and keeping small origami. It starts like the paper crane:
Fold the bottom corner up and unfold
Fold the top to the middle point and unfold(looks a bit of in the picture since it's going up a bit)
Fold the bottom corner to the half of the top part
Fold over the middle line, repeat on the back
Flip the layers, working on the sides now
Fold three edges to the center except the top one
Fold over the middle line(already have the fold)
Repeat on the other side and open up
Now you have a cool box :D Hope you try this out. Prepared a really cool post for tomorrow but I have to finish one part that requires printing, print office doesn't work on Sunday. I'll make it as soon as I can.