That looks amazing. (Like Lurker, the iron cross doesn't appeal...but hey, neither would a knife with Big-Bird on it...although it may be a good comic-relief with the whole Byrd series, especially given the Cara-Cara's size. I digress...lol)
Is it an etch or true engraving? I see a lot of potential either way.
Here's a hair-brained idea that may really test your process/skills/patience.
Brace yourself:
How about Paisley(sp?) designs? You know like the old neck ties. I could see that working out really well with the thumb-hole design on these knifes and may take it another step towards being a large "gents" knife.
EDIT: Went to your sight. Very nice, I don't think the paisley would be too much of a challenge at all! Solid prices as well.