I'm not really a fan of bumper stickers. Most of the time I wonder what a person is trying to accomplish by plastering their car with pieces of their assumed identity--especially since so many bumper stickers are profoundly stupid. (W. Craig has a few nice examples for you, though he's talking about license plate covers.)
(Alright there are at least a few exceptions. I love this bumper sticker, and this one is way above average, but I still would never put either on my car. Or my bike.)
My anti-bumper-sticker bent notwithstanding, Wendy and I saw a bumper sticker we liked so well that we decided it was worth making Corbin unbuckle (at a red light, relax) to dig my camera out of the back of the van. I leaned out the window like Bo Duke and snapped a few pictures so I could always remember it. Best bumper sticker ever. (I'm willing to entertain other candidates, but this one is just perfectly suited for my irreverent, bike-centric mind.)
You've stumbled upon the blog of Paul Malan. I love my family, I love to write, I love to ride my bikes, and I love to take pictures. Maybe someday I'll think of something clever or arresting to say right here.