yup, google for it .. also be sure to install only trusted s/w which allow for logon (boot screen) wally change option, coz i once applied a bootscreen image to change the usual Win XP imgae using (sum good renowned s/w i dont remember nw,maybe it was 'talisman' or sumthing else..) and it jus made my bootscreen FREEZE..
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instead apply a vista transformation pack,(google for it) and ur PC will be new overall..
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Cheers n e-peace...
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this is a screenshot of my desktop (i hv applied the vista transformation pack+xp SP3) jus to giv u an indication of how well ur desktop can be modified but yet simple and lite on the system
*img7.pictiger.com/6af/17046080_th.jpg