I have a wall of pictures in my living room that is a work in progress. It includes art that I've bought when travelling, in Perth and off the net, plus photos, posters, some vintage items and ephemera. The positioning of the pieces was not planned and they're hung pretty close together to compensate for this.
One of the photos I picked up in a cafe in Portland. It's of Seattle by a Seattle-based photographer. You can see her web portfolio here. One of my favourite photos is this one.
A print that I also picked up in Portland is by Apak Studio. Aaron and Ayumi are a husband and wife team who make sweet prints with little characters like the ones in these examples. They have an Etsy store and a blog too.