The last option is to resize the actual gemiconXXX.tga icons bigger than 24x24 and change the spellgem UIanimation in the EQUI_Animations.xml file but you would also have to redraw all 150+ icons in the same current order as well as the alpha channel etc. Also you would have to redo all of the hotbuttons in the hotbutton.xml file to match the new size...
You can see an example of this in the 1a option download for the titanium default UI where it uses Velious spellgems. You can see the gems are a different size (34x28 iirc) and the hotbutton spellgem holders changed to match.
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