I usually start with a pattern that I know I MAY sew up in the future. I start with focus fabric that MAY be yardage. Find coordinating fabric. that works with the pattern. I store all the fab and pattern in a zip lock bag with the pattern inside. I have a plastic tub where all mly kits are so when I just want to sew something, I shop my kits. I took one day a couple months ago and shopped my stash and made kits. I sew for Project Linus and this is a great way for me to be able to turn in at least 4 large quilts every month.
I make a lot of skakeboard quilts so I have a zip lock bag with perfect fabric.
Have fun shopping your stash.