Have you ever heard of the trend known as "guerilla gardening?" Basically it means that you put plants in places over which you don't technically have "jurisdiction"--that you don't, er, "own," and which you have no legal business messing with.
But you mess with it anyway. Because you're a succ-er. And succ-ers are the badasses of the gardening world.
I tried my hand at guerilla gardening for the first time the other day. There are some unattractive concrete planters near where I work, filled with oft-neglected geraniums. So what did I do about it? I smuggled a wee, hardy little echeveria with me and as I walked by the concrete planter--BAM!--I quickly planted it!
Okay, so it's dwarfed within the planter, but you get the idea. I'm totally going to do this some more, because it is AWESOME.
Here's your challenge: do a piece of guerilla gardening yourself, then send me a picture. I'll post them (anonymously, if you wish) on this blog.