I noticed that spells use two infoboxes styles - #1 example can be found here, and #2 example can be found here. However, I believe that we should use only one style, right? I vote for making a new one, to match the new styles some infoboxes have, either the pink one we use for powers and artifacts, or a new color.
So far, Charmdozo suggested a gypsy green infobox (I made a little different version, too), and I suggested purple infobox. Take a look and let me know what you think about them.