Just some general information:

If you are just starting out, or, if you are looking for more images here are some sites to check and find Evangelion Wallpapers and images:

http://www.pixiv.com
http://wallbase.cc/home
http://www.deviantart.com
http://www.minitokyo.net/Neon+Genesis+Evangelion
http://www.zerochan.net/Neon+Genesis+Evangelion
http://danbooru.donmai.us/posts?utf8=✓&tags=neon_genesis_evangelion+
http://konachan.com/post?tags=neon_genesis_evangelion
http://www.google.com/imghp (Seriously works wonders)

Evangelion Transparents for personal Wallpaper making:
https://www.dropbox.com/sh/vrni815bump4ekv/hNUbrEP5eN?lst

Don't forget to post your creation here!

Your new favorite picture is out there, go find it! ... then post it here!