how do you make your background change on every boot?

[curtains]

simple question
how do to make your background change on every boot?

Im pretty sure in older windows you could do it but i cant find it on xp can anyone help plz

 

[patrickv]

Im not sure how to do it at every boot but i did a google search for you it'll help
http://www.google.sc/search?hl=en&q=boot+changer&btnG=Google+Search

 

[subtle]

http://www.freewarehome.com/index.h...Desktop/Cosmetic_Tools/Wallpaper_Tools_t.html

and

http://www.download.com/Automatic-Wallpaper-Changer/3000-2336-10560884.html