>>40313445Based Gen 1, obviously, on Paras. Solid color body, similar eyes (also similar to Venomoth). Seemed to fit, both based off of cicada nymphs.
For Gen 2, I decided the multicolors can stay, seen in many of the Gen 2 Bug-types. The eyes becomes slightly more abstract in this Gen, too, although they weren't as crazy as later Gens.
Gen 4/5 seemed to see a radical change in the general color pallet of Pokémon -- there were much deeper hues used. I chose a darker brown, but similar to the color it used to have on its body, as well as a golden color similar to Ninjask's head. Seemed to fit with Ground-type as well. For Gen 6/7, I removed part of the leg. Admittedly, with Pokémon like Skorupi and Venepede, I could've done it in the Gen 4/5 regen as well. I added a triangle marking, which I had done more of, but in my edits I apparently lost that layer. I also enlarged the head, ala Scatterbug and Dewpider.
Not my best work, but I hope my comments allow you to see my thought process. My goal isn't to truly overdo it, just look at trends and go from there.