The wonderful literati of Spander and Giles/Wes luv makes HP icons. You can find them here. (http://theboywhoscored.slashverse.com/tbws.html)

so_severus makes some nice slashy ones, found here. (http://community.livejournal.com/d0rk_icons/)

And kc_anathema just makes oodles of icons. She used to say on her site she didn't even need credited but I do anyway. HP, Buffyverse, Twisted icons, just oodles. Found here. (http://pics.livejournal.com/kcwriter/)

Hope that helps you luv!