Georgetown has a lot of well documented and popular street art, so we spent a solid hour or two per day (before the temperature became oppressive) exploring the streets and enjoying the sites.
All around town you see 2D iron art, part of a commissioned project completed by SCULPTUREATWORK displaying historical caricatures of life in Penang.
Another unique feature of the street art here are murals that use a real item (motobike, swing, chair, etc) as part of the art.
Of course there are also the standard murals, stickers and silly sayings. We love street art and found Georgetown to be a good destination for this (plus, the food is awesome). You can see all of our street art photos from around the world on Flickr.