To use a texture with TC you need the same Magos and create a Material that has 2 layers inside: one for TC (the color), another - for the texture. And in the layer of color you pick the color you need from MPQ, say, blue. Then you give your Geoset this Material. And it will always stay blue.
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Quite handy in some situations. Like, you need always green gems for Undead? Get a shiny TC gem and make it forever green. You need always purple walls for Night Elven barracks? Easy! Want some dark-green roofs for Kul'Tiran farms and shipyards? Here you go! Because you may not find any dark-green bricks in the standard MPQ, for instance.
The prob with cape is that it looks like it has circles from above, and like it's a drill tip on the top ;D (Maybe just my perception!)