The wiki has spell icons in .jpeg format at this link. Clicky the pic to see the 42x42 version, the link under the 42x42 will bring your to just the normal image.

I have no idea on the xkeys, but you can now set hotkeys for all 10 spell banks, so you can avoid switching the spellbanks altogether. Are you using a whitelist/blacklist somwhere? Or perhaps look at some of the stuff here.