As I said earlier, in addition my usual picture sources from the past, I will be running around flickr looking for things that catch my eye. If I find the pic myself, I will just link to the page - if I see it at another site first, I will give attribution.
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.