In this context I took the OP to mean kilts made with modern fabrics, sewn pleat edges and all that, maybe with cargo pockets but not necessarily. As a rule I don't think of tartan as fitting in the box with Utilikilts and the others, but then you've got something like the Bilt Kilt which is certainly a very modern kilt even when tartan is heavily incorporated into the design.

Then you've got the "is it the kilt or how the kilt is worn that makes it contemporary/modern" argument, which is completely valid.

I think a visual guide to this sort of thing would be an interesting read for sure. I can barely put two sentences together so tackling it on my own is way above my pay grade, but I'd be happy to lend a hand if someone was interested in a collaborative effort.