its all talked about on here -
http://forum.ppcgeeks.com/showthread.php?t=85135
http://forum.xda-developers.com/showthread.php?t=500178
i get all of my hd wallpapers from this site -
http://forum.xda-developers.com/show...ghlight=hdwall
they are hd wallpapers and are in .cab format so just download and install. these are really good wallpapers and dont look grainy at all.
here is a link to make your own hd wallpaper cabs.
http://forum.xda-developers.com/show...ghlight=hdwall
when i create my own wallpapers using the above link, i get all my wallpapers pics from
http://www.zedge.net/ or
http://480x800.blogspot.com/
just make sure you are searching wallpapers for the tp2 cause they are resolution specific for this phone. its also a great website to get good free ringtones and sms tones!
hope that help!