The Game Piece Layout feature within VASSAL won’t do hex-shaped pieces, but you should be able to knock some together using whatever image/layout software with which you’re most comfortable. Inkscape is my most frequent recommendation, but far from the only software that can do the job.
Thanks guys… While hexagonal pieces aren’t common, they aren’t that rare either… I would suggest adding the hex shape as an option to the “Game Piece Layout” feature for V4.
Not sure if there will be such a thing in V4, and if so, it’s far more complex than it sounds, as the range of shapes such a shape can be are infinite. What you want is a hex in the shape that fits an arbitrarily defined hex grid,