To spruce up the space, at least just for a while, I have grabbed some of our old racing bibs, old sports photos and some tickets to sports events that we went to while living in the US.
I like it because it is one space that reflects both of us (not just my tastes - whoops!). Also, it is made of tangible items that mean something to both of us: our tickets that we held when we went to our first NBA game (on Christmas day: our first Xmas without our families around), the passes to the local baseball match just before we moved home (and the all you can drink tickets that went with them!), and the race bibs I wore in my first road race and first half marathon. Best of all, I already had the stuff lying round in boxes, so it was free!
There are heaps of ways to personalize a little corner of your home. I really like this idea to reclaim some crappy art and make it your own: http://simplemom.net/what-to-do-with-bad-paintings/?doing_wp_cron=1327006086
Also, printed canvases with your own photos are all the rage now but can be a bit pricey. Instead try this idea: http://www.curbly.com/m/13293-diy-biggie-size-photos-for-under-20