Most neck knives are skeletalized tang handles or black micarta/G10. I don't know how "fashionable" they are to one's taste. Madpoet makes I think an attractive exotic wood handle, persian neck D2 steel knife with a leather sheath. I don't know if concealability is of concern, but it doesn't look particular good for that because of thickness.
Ed Schott has a small utility CPM3V steel knife with a cool blue G10 handle. I asked him to downsize it, thin out and skeletalize the handle, and use a kydex sheath for neck carry. It may be faulty thinking but I asked him to use a light green G10 instead of the blue because I think it would show less through a light shirt than the blue and match my darker skin color better. His other choice was black g10.
Both makers can be found in the link pages. Both knives are just under a $100.
If you want a good thin, light concealable neck knife without the "looks", you can't go wrong with a REKAT. Get one of these quick since REKAT will not longer make them. It's about $50. Livesay is another maker offering inexpensive but good quality no nonsense neck knives (so I hear from the Livesay fans). They are about $20-$30.
sing
Oh yeah... you can probably get a Perkins pocket knife and custom order a neck sheath. Perkins makes a distinct style that is fairly to very attractive, depending on taste.
[This message has been edited by sing (edited 11 August 1999).]