I do it off and on. I always process my scraps into a few sizes that I use often, one of which is 2.5" squares. I also use a lot of black, so I started pairing rainbow hued 2.5" squares with a plain black square (at least when I have dark thread in the machine). I ended up with a stack of a few hundred of them. I keep meaning to turn them into something. Either a specific color + black 6x6 blocks, like red + black, yellow + black, etc, or everyday placemats for my kitchen. (Marionberries made me an amazing set that I won’t let anyone eat off of, because they are tiny works of art that I want to hang as wall quilts.) But I always seem to have quilt projects on the board, that take priority, so I haven’t gotten around to turning them into anything.
Though I DID use a ton of them up as the pieced border to this Black + Rainbow BOM quilt. If you scroll down, you can see how many I used in the staging photo on the bed. Those were all previous Leaders & Enders. The gaps I filled in from 2.5" squares in my bin, to try to make the color gradients as smooth as possible.