Coloured Spell & Ability Icons

I'm interested in re-colouring the spells and abilities of both BG1 and BG2 to give the game a fresher feel. I can extract and rework the icons, but I have no idea how to re-pack or compile them. I've included a few of the ones I've worked on already, nothing fantastic, just the addition of colour. If anyone can offer more information about re-packing icons or would volunteer to do such, or if it can even be done, let me know and perhaps I can work something out.