Kate Pruitt of Design*Sponge posted a lovely DIY upside-down planter* project that makes this guerilla's fingers twitchy to get crafting.
For the step-by-step instructions, check out Kate's post.
*What's the fascination with growing things upside-down? I admit to being mildly intrigued by the whole thing, but I don't quite get it. Can someone explain this anti-up phenomenon?