I love shelves, but they get piled high. One storage system that I experimented with was to screw jamjar lids to the front underside of a shelf for small fiddly parts in jars that screw into the lids. It was great for the small fiddlies, but hampered shelf access. If I get the wall space, I might try dedicated jar-shelves. I'd be too tempted to squeeze other bits amid loose jars.