A couple people asked whether the Go Cutter comes with any dies. It comes with this one that has 3 different blocks -- a 4 inch square, 2 inch square, and 2 inch finished half square triangles. I just placed fabric over the 4 inch block (4.5 with seam allowance) to cut my cat squares.
This evening I assembled the cat blocks and then started playing with the isosceles triangle die and a set of fat quarters. I made a mistake and didn't order the size triangle I needed to turn these into Kaleidoscope blocks but I think I'll just cut those by hand.