This lovely jumping spider is a common sight on walls around the Vancouver area: meet Platycryptus californicus, a member of the Marpissinae subfamily of Salticidae. If you live in Eastern North America, another Platycryptus, P. undatus is also common.
At first glance, P. californicus seems a wee bit boring. They are overall grey and drab, and hang out on grey drab walls. When shot up close on white, however, these little salticids reveal their beauty. I found this one yesterday on a wall in my back yard, and a couple days ago one was in my living room. This is truly one jumper that has adapted well to the urban habitat.