you can get themes from games and your computer/laptop.
games=completing levels,missions,goals,set of levels.
computer/laptop=get the picture on your computer/laptop then connect the PSP to the computer/laptop and put it in the PSPs memory.
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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
pspube.com (videos) (can only do it on psp) psponme.com (flash games) pspoof.com ( Demos themes and wallpapers) pspicy.com ( Movies Musics TV shows) (can only do it on psp)
Download custom theme creator(live search), and use the tutorial here: http://psp.about.com/b/2008/06/24/psp-theme-tutorial.htm im happy to help!
There is no PSP version of Minecraft.