I think there is lots of room to tweak the design of a sgian and still keep its essence recognizable. The use of a full tang is brilliant to me because it makes the knife more sturdy but not too many other makers are doing it. A little Google image searching has brought some interesting ideas (though not all are full tang), which I'll throw out for discussion:

Crandart knives


By Rob Millar


By Daniel Fronefield


A "contemporary" sgian sold by various retailers:


By Omega Artworks:


By Stockwell knives: