I wrap my scrap pieces around comic book boards if I don’t want to cut them. Since I store all my fabric in drawers I cut the comic boards to fit. Just fold your irregular scraps so that you have regular edges and put them on the boards. If I have several pieces of the same fabric then I put them all on the same board. A note pinned to the fabric tells me at a glance if the piece is irregular and how big, or if multiple pieces then how many pieces and what sizes.
rob