Here I show you how to make origami icosahedron from 30 sonobe pieces.
Step 1: Fold post-it in half glued side inside
Step 2: Fold bottom and top in the center
Step 3: Fold both corners on the upper line
Step 5: Fold the corners over
Step 6: Make a square and fold it into triangle
Step 7: Make 30 sonobe units
Step 8: Place three units together to form a triangular pyramid
Make them in cycle of 5.
Step 9: Build it - it's like a puzzle
Just form triangles and you will see form shaping.
Step 10: Alternative method for building
You can also build 2 cycles of 5 pyramids separately. In one of them connect middle from pyramids and then connect the top from ready cycle of 5 pyramids.
Step 11: Now you have nice modular origami to decorate your desktop