I've got a few tartan suggestions.

Muted Black Watch ( a new look to an old classic)
http://www.scotweb.co.uk/images/tart...blackwatch.jpg

Galicia (I have only seen once ever made into a kilt). http://www.scotweb.co.uk/images/tart...ity/004946.jpg

Catalan (This tartan is extremely rare, never actually seen it woven).
http://www.scotweb.co.uk/images/tart...ity/002071.jpg