These are quite useful sites if you have problems in finding backgrounds or ways to design something:

Forum designing
- http://forums.ifskinzone.net/index.php?act=idx


Tutorials
- http://www.userbars.com/userbartutorials.php {links to user bar tutorials}
- http://www.planetphotoshop.com/tutorials.html
- http://www.eyesondesign.net/pshop/tuts.htm
- http://www.gurusnetwork.com/tutorials
- http://www.reality9.com/main.html
- http://biorust.com/tutorials/index
- http://www.pslover.com/search/ {Thanks@MAXI}
- http://www.eyeball-design.com/
- http://www.absolutecross.com/
- http://www.stridingstudio.com/
- http://www.wastedyouth.org/
- http://user.fundy.net/morris/
- http://www.tutorialman.com/
- http://www.polykarbon.com/
- http://www.tutorialized.com
- http://www.pixel2life.com/
- http://www.3dcafe.com/
- http://www.psd-tutorials.de/ {german lang.}
- http://www.designnation.de/index.html {german lang.}
- http://www.drweb.de/photoshop/index.shtml {german lang.}
- http://www.gfx-artwork.de/tutorials/tuts.html {german lang.}

Images, backgrounds, textures
- http://www.pixelquelle.de/ {many pics, german lang.}
- http://www.fotodatenbank.com/ {several pics, german lang.}
- http://visipix.dynalias.com/index_hidden.htm
- http://www.nasa.gov/multimedia/imagegallery/index.html {Pictures taken by NASA}
- http://stock.d2.hu/
- http://www.deviantart.com/
- http://www.creativity103.com/
- http://www.alamy.com/
- http://www.photobreed.com/
- http://www.openphoto.net/
- http://www.freeimages.co.uk/
- http://www.arraich.com/freephotos.htm {pictures in black&white}

Renders
- http://animerender.com/forum/index.php?act...&module=gallery- - http://planetrenders.net/renders/index.php


All-time helpful
- www.google.com


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Links not working? Know more useful websites?
-> Send a pm to me including the links!

I will check the sites and maybe post them here