[Joebe]

Grunts can be based off of anything you'd like, it would just be a visual effect as their abilities would all be the same.

The problem would be from your monster-of-the-week and executives. If you choose to base it off some really esoteric theme like prehistoric insects of which there isn't as much info to find and the audience couldn't differentiate between, then it would be more difficult designing unique complementary powers for each of them.