Our garden had mixed success this year, but one crop I was very pleased with was the Black Hungarian Peppers I ordered from Seed Savers Exchange. I've tried several times to start peppers from seed, but this is the first year I had anything to harvest. The peppers start out a dark, eggplant shade, but turn red when they're ripe.
They're good-flavored mildly hot peppers, but the thing I liked best about them was the way the plants looked as they were growing. The seedlings are nearly black (leaves and all; sorry I didn't think to take a picture last spring!), and the even the blossoms have that purple pigment.
Check out those black anthers!