Hamish, some of the Welsh tartans are absolutely fantastic! The Phillips tartan is absolutely beautiful in my opinion (no I'm not biased from the Phillips side of the family, why do you ask?)

The Welsh National (St. David's) tartan is particularly handsome. Usually reds and greens just remind me of Christmas, but the shades in St. David's always make me think of deep dark forests. Very earthy tones.

Most of the family tartans are carried by the Welsh Tartan Center in Cardiff. Check this out.

http://www.welsh-tartan.com/family/index.html