I've still not settled on fabric. I pulled out my stripes and found some notes on another project to use them, and decided they would best staying where they are.
Though while digging around for fabric to cut for the Bday candy swap, I found a couple of larger yardages of some neutrals that I could use as the background. I've got a tote full of precuts that I'd like to use up on something - so maybe this would work.