Cubes turn into spheres

A few months ago, adviced by a friend  from the Romanian Origami Forum - Nicoleta Mihalcea,   I started folding a Cube created by David Mitchell, made out of 6 pieces of paper, that I simply fell in love with! So in love, that I ended up folding about 220 of them!
And then, because a friend in need is a friend indeed, I asked another great origamist - Ecaterina Vasile, to give me some directions for turning my cubes into...balls. :)
And so, 220 cubes later and 1320 pieces of paper, I have two spheres.

For this one, the pink pieces of paper measure 3cm, and the yellow ones, 1.5cm:

 










For the next one, the black pieces of paper measure 6cm, the blue measure 3cm, and the white ones, 1.5cm: