I think we've all done what you did.
I once cut a quilt, well, 1/2 of it, then took a break for a couple days. Went back to it, THOUGHT I was doing good, only to find out, I cut the WRONG colors for the WRONG blocks. UGH!
I took the entire thing, put all the same shapes and sizes into baggies and it will be for a scrappy triangle quilt I will make one of these days.