One of the best discoveries I've made...
pickled mussels and cockles by Parsons - not only are they delicious, they come in lovely little clear glass jars patterned with the aforesaid seafood.
These are just the right size for holding tea-lights and, dotted around the garden/patio on a summer's evening, they make a very pretty lighting feature.
Apart from that, there are several other uses: I've painted them with "stained-glass" paint, filled them with bath crystals/salts, lotions, or even just different coloured sands, and a friend made honey scented candles in them, all of which we sold to raise funds.
Oh, and they're also good for keeping screws, curtain hooks and other assorted bits and pieces in.
Last, but not least - coming back to the gardening theme - you can sew individual portions of cress in them!