Tri-Recs ruler to get perfect little triangle-in-square blocks. (Mostly perfect blocks, there is still a human involved.) I cut the required number of pieces out of my chosen fabric. If you want a great video tutorial on how to use the Tri-Recs I highly recommend Bonnie Hunter's tutorials. They are clear, precise and will help even the most novice quilter get started.
I made a few more than I needed, but only by a handful. If you want to know how many are required here is the link back to Quiltville. Bonnie Hunter is an excellent teacher.
If you want to see some of the other great mystery quilts you need to go check out the clue number two link party hosted on Bonnie's site.
Day 7 of the 31 Day Blog Writing Challenge.