I've made several Mod Mosaic quilts (back between 2010-2012), though I apparently only blogged about one of them as a WIP. Still, it's a super fun block to do with scraps. When my quilt guild put out a call for quilts to auction at the quilt show in February of 2017 I made two mini mosaic quilts. The theme for the show was the color red, so I did both with my red scraps and did one with white spacers and one with black. I backed both with a plain unbleached muslin, nothing special, and bound them in the same fabric that I used as spacers.
Stash report (2017):
Fabric Used This Week (in 2017): 2 yards
Fabric Used Year to Date: 51.5 yards
Fabric Added This Week: 0 yards
Fabric Added Year to Date: 48 yards
Net Fabric for 2017: 9 yards used