I've been wanting to do something a bit different with cheap garden solar lights (89p - B&M!), as I'm not entirely keen on their traditional casing. So, I already had some empty jars in the house and bought some cheap ones too. Although not life changing, they work a treat and create enough free light to find your wine glass after the sun goes down.
Here's what I did and the end result:
Glued with all-purpose adhesive