Well, if you have a digital camera, taking pictures of the ground is always a great bet. LOL But barring that, try these to get you started: http://perso.club-internet.fr/lemog/ http://textures.boom.ru/texture/building.htm http://www.animax.it/ There are some great free texture collections available both from Newtek and Alias: http://www.newtek.com/ http://www.alias.com/ And there are seemingly endless sources elsewhere on the web as well.