Hi Cindy, if you look at the candy (2.5-inch) square swap on this board (under "member swaps and round robins") there are lots of posts with links to ideas for 2.5 inch squares. Okay not 3-inch but same concept! You do have to do a bit of scrolling though.
I wish I were in your spot with scraps. I'm a new quilter, not much stash and fabric prices are getting high. So many people here with either too much stash, or the opposite problem, fabric budget being squeezed by inflation...
Wishing you a fun project with those little squares!
--Pam