Thanks Casey.. you're very kind.
Yes, I know... finding medieval textures is kind of hard. We do have a lot of castles around here, but I haven't got the time to take photos. However, entering "Castle Wall" or castle in the google picture search has helped me a lot.

If you are looking for medieval textures, this link might be helpful:
http://www.davegh.com/blade/davegh.htm