My thrifty nature compels me to save them. Larger bits get tossed in labeled plastic containers by color and small, even tiny, bits get tossed in a shoebox lid. I've had that lid on my work table for a while and have mentioned it before. Still looks much the same even a year later. Weird.
Occasionally I'll set out to use as many of this bits as I can in a mosaic and my 'River Sunset' clock is the result of my latest effort:
That largest red boulder was the inspiration for this entire piece. I found it just the way you see it in the shoebox lid - don't recall what project I nipped it roundish for then rejected it but I think it worked perfectly here. Just was waiting for its time. Ha, lol, didn't intend the pun :)