Where can you use bonus triangles? EVERYWHERE! Bonnie Hunter gives you a fun block pattern, Yankee Puzzle Plus, that uses all of the bonus triangles from the stitch & flip corners from the diamond-in-a-rectangle units in the block as well.
This tutorial uses the Essential Triangle Tool for half-square triangle units and the Bonus Buddy Ruler for stitch-and-flip units. You can use any method that gives you a 2 1/2’’ unfinished half-square triangle, finishing at 2’’ in the block.