Tabletop Miniatures

I primarily paint with proper hobby paints, but I sometimes demonstrate craft paints (with a few key techniques to alter them) as a viable tool both for new painters to cheaply dip a tie in the hobby, and as tools for experienced painters to use in supplemental roles to lower costs. I also want to show off artists inks being useful as both stains and washes.

I am currently planning to do a Warhammer 40k Ultramarine in this style, as well as some Roman soldiers. I have several muscled Catachan-styled third party minis and am curious what color schemes for them people might be curius about, as well as other minis types or colors they would like to see?