I've loved rubber stamps ever since I got my first alphabet set as a teen. I stamped everything! I used them a lot in my illustration at college and I still use them sometimes for present wrapping.
I recently bought this rubber stamp to use on my packages. I think it's nice to brighten up an envelope, I always gasp when a beautiful package comes through the door (always from etsy), it makes my day (maybe I need to get out more ;-)
Talk to the Sun has so many fabulous rubber stamps in her shop, I couldn't possibly pick all my favourites, but here a just a few.