Kristi Mcdonough of Schnitzel and Boo has created an HRT (half rectangle triangle) tutorial for you after contemplating her design wall from the New Colourshott 10″ Square Pack of colours 21-57:
and turning it into this (on a background of Colourshott 32, Amalfi):
Look forward to seeing it when the quilting is done and (to continue the design contemplation theme) whether the current vote for matchstick wins through.