There are Textures on mass in the internet. Here some pages.
http://www.thewall.de/content/half-life:tutorials:eigene_texturen
this is a good tool to for textures and there must be some texture, too. but it's a german site
http://au.conitec.net/
http://www.terminal26.com/
also models and so on
http://www.robsite.de/links.php?link=texturen
incredible source xD
http://www.noctua-graphics.de/deutsch/freetex_d.htm
also german

ok, this should help .