who knew: pennies in the garden repel slugs and make hydrangeas blue! "Here’s a simple garden art project, that is wonderfully mindless. Use a strong glue to attach your surplus pennies to a thrift store bowling ball. It would be a great project to do with your kids on a rainy day. For the glue, my favorite is made by Amazing Goop, and I use the Home and Garden or Marine formula, because they are UV resistant as well as waterproof."