This year my husband got me some resin terrain from Itar's Workshop, including some sci-fi pieces.
One of these is IWS-IND-003, "Engine" and one of them is IWS-IND-001, "Power Generator", but I can't recall which is which. Here they are with Reaper's Dee Dee, Astro Girl, for scale.
Please pardon my ignorance. I don't know know if these are true-to-life or pure fantasy, so I decided to paint them how I liked. I didn't take pictures for the earliest stages.
First I primed them with titanium white (Golden matte fluid acrylics) with a very little flow improver added.
Typically I wash over this with burnt umber to bring out details before painting. But for these pieces I wanted elements to glow as if lit from within. I have found that lighting effects work better over a pure white base, so I added them before the umber wash.
One of them is going to have a cold, green glow, like fluorescent lights. The other has a shaded violet glow from above. Both have a bit of warm gold light.
The mixes are simple. The green was just a touch of phthalocyanine green with titanium white. The violet is the same with the addition of some quinacridone magenta. The yellow is simply yellow iron oxide with white. (Reaper colors = Clear Green (almost), Pure White, Clear Magenta (probably), Palomino Gold)
Anything painted on white looks deeper than it is. These colors are pretty light, and to show how light, here's my half-painted Reaper frost giant next to one of the resin pieces.
For the last preparation step I washed some burnt umber over the pieces, brushing only lightly over the lighted areas to leave the recesses brightly colored. I may have missed a cranny here or there which I will fix as I go along.