Take a look at Kiltgoodies.com--http://www.kiltgoodies.com/shopindex.htm--for some really original stuff you won't find elsewhere.

Also, if there's something you really like, find a pin of somekind that represents that and use it. Kilt pins can be about anything youwant them to be. The Xmarks kilt pin is quite different from other "old fashioned" types, but it is also quite popular.

Bottom line, find something you like and wear it.