Where can I find high quality background images? Stuff like landscapes, 3D effects, and whatnot?

http://www.deviantart.com

if yur using deviantart then u might want to ask first cuz the art there kinda belongs to all the artists
but they do have a lot of good stuff

does any 1 noe how to use photo shop properly.......... i cant seem to make good anime wallpaer
any good sites any1

Here's a few sites for you Andrew101. Think they will really help you out or altelast inspire you:

http://www.good-tutorials.com/
http://ningen.nattoli.net/tutorial.html
http://www.pixel2life.com/main.php
http://www.imanimetions.net/main.php?nav=tutorial
http://ishwalls.5gigs.com/DP2/DP.html