Draw me a knife that:
looks nice, in your opinion
is practical for a stated reason
will sell well for some reason
I'll pick one, make it and post it to you if you give a good drawing and reasoning.
TL;DR design a knife you would like to be made.
Pic half arsed related
5 and a half inch blade, half inch guard on each side, blue rubber handle wrapped in yellow cord. /out/ stamped on blade