What should I do with my latest goodwill finds?

I think they used to be lampshades, but I'm not sure. All I know is that I love the pattern (I can never pass up circles) and for $2 I figured I could spray paint them and find an interesting use for them.
Even Cooper thinks they have potential, but I'm pretty sure he was just waiting for me to turn my head so he could lift his leg on them.
I'm thinking I want to use them outside somewhere, maybe as planters, or use them as candleholders on my patio table. Any ideas?