How to use unique macro Icons???

Is there a way to use icons other than the ones that can be chosen from the macro list? I know choosing the question mark will show the icon of the spell/item that is being used.

I'm trying to see if there's a way I can edit the macros textpad in the WoW directory to show icons of items and spells that I do not have.

For the question mark icon, it's INV_Misc_QuestionMark. For Earth Shock, it's Spell_Nature_SkinofEarth. Is there anywhere I could find a complete list of names so I could try it out?

Icon list: http://www.wowwiki.com/WoWWiki:WoW_Icons

You can make any custom images, and put them in the /Interface/Icons/ folder, and use them in macros as well. -- so long as they follow certain rules.

Quote:

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If you would like to use custom icons for your macros, you can place them in your World of Warcraft\Interface\Icons folder (creating this folder if it doesn't exist) . The files must follow the same guidelines for UI textures . Namely, they must be either BLP files or 24-bit/24-bit+alpha uncompressed TGA files. Their dimensions must be powers of two up to 512 (e.g. 32x32, 512x128). Note: any images that aren't square will look squished on your action bar.

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From the UI forums sticky :D