I like this sticker that was at the MD March for Life last week. It's about time there was a coexist bumper sticker that has a pregnant woman with a preborn child (yes that's redundant).
They're at Stickervoice.com
(click on the images below for larger versions)
UPDATE 7/29/2011:
I have a Pro-life Coexist T-shirt. I'll have to take a picture of it soon. Below is a picture from the website:
(Click here for a PDF of the Pro-life Coexist T-shirt.)