There isn't nearly as much bruising as I expected, but it's still kind of gross, so beware!
The two most noticeable bruises were inflicted before the tech actually put the needle in, I think; he marked those two spots as possible places to put the needle. The top one is where he actually ended up putting it, and you can see some bruising spreading out to the right. Not pleasant, but I've had a lot more bruising, and in much more interesting colors, after giving blood in the past. My arm is still pretty sore, though.
I guess maybe the Red Cross shouldn't hire me as a spokesman, eh?