These are the place I have gone in the past for my own site they might have something for you.

	www.digitalblasphemy.com is was definitely worth the price to become a member.
	www.mikebonnell.com has many beautiful backgrounds for you to choose from.
	anfyteam.com has an excellent selection a Java applets for spicing up your web site.
	www.3dmindscape.com is a site that specializes in 3D rendered wallpapers.
	www.byfreeweb.com/freewebdesign/inicial.html is a site dedicated to providing free ../Images for use in web site design.