I only use the boomer's fabric in the solid triangles and make the two tone triangles out of my own fabric. That way, no waste at all for the boom F8
But as Joan mentioned.. I do have to pay attention to which direction I am cutting them! The first block I did here, Sewbiz's , actually had a cutting "opps", with two of the triangles facing the wrong way. So.. eh, I made a different block than originally planned!