Wow - this block went together quickly - I'm not sure I actually followed the instructions word for word, but...
...I have as 12" block complete with sashing!
The green is the same as on my first block (here) and Westminster Fibres, I'm not sure about the yellow - maybe Metro dots. The solid is more purple in reality and is a Kona - maybe lavendar, and the pink is Art Gallery.
This is block 2 in the Skill Builder BOM at Pile O'Fabric