the best place is to go to www.free psp wallpapers.com
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http://www.psp-themes.net/ Place theme.p3t (or .ptf) file in X:/PSP/THEME/ folder and select theme from XMB->Settings->Themes X is your psp USB or PSP media card Or Download Only theme file directly from your PSP internet browser.
YES. You can put the same themes on all models of psp
This websit=http://www.psp-themes.netevery theme is free but you haf-to regester but it's still free
http://www.consolespot.net/forums/index.php
sony have 5 psp psp fat,(1000) psp slim, psp lite, psp slim and lite and psp 3000. the best is psp slim and lite . and the cost $ 299.in game stop best buy and save $ 2o dollar