A while ago I came across something on Pinterest for making Borax Crystal hearts. I thought it was rather cool and knew I had a box of Borax in my basement.
The other day I finally got around to trying it out. You'll need a jar, pipe cleaner, string and craft stick or a I used a swizzle stick, and boiling water. If you follow the link above it will give complete directions for doing this. The pictures aren't very good but you can see there are crystals formed on my heart. When I dumped the water out I left the jar sit on the counter and I even got a layer of crystals on the bottom of the jar. At first I didn't think it was going to come out but I did manage to clean the jar out