It's definitely possible...I think you have to do it as a complete image that you then overlay over the entire page.
I THINK that
Code:
td{background: transparent;}
OBJECT, INPUT, FORM, TXT, #tbg, #m, #mb, #n, #ban { visibility:hidden; } table, td {background: transparent;} #ban {display:none;} hr {display:none;} img.hdr {display:none;}
in your style bit will supress all the links etc etc for the normal neopets side bar. I've got to admit that I haven't the foggiest clue to be honest. I may have made all that up.
BUT my best advice is to go and look at the
site spotlight area and click on user lookups for those, as they are likely to have jazzified their user pages.