I use my own photo as my display picture on MSN, Ben. I can use a photo where I'm on it together with someone else, but not only does this bring confusion with people who never saw me in real life, or don't know how I look like at all, it also makes my face look quite... blurry.
Just yesterday I met someone on an online chat who is now a contact on my MSN. I'm not sure if she drew conclusions because of my display picture, but I currently use one where I'm together with a girl and once in a while use one where I'm hugging one.
Despite that I am (theoretically) 'taken,' I don't hold back on letting people approach me, or that I approach other people... well, unless one specific person is either around me, or just online.
Regardless, the most recent photo of myself (only) was when a friend asked me to make a photo of myself while wearing my orange shirt, related to the World Cup a while ago. But that has been a while ago already... not to mention that I don't look too great on it. ("But then again, I always look bad on photo's," "Really? Well, so do I," "Alright... I'll write that down. Another person who looks bad on photo's... you look cute on the one you sent me though.")