I was at the dollar store the other day and I bought some plastic dino toys. I bought three green ones (its embarrassing I can't think of the name of the dino) and three orange triceratops. They look a little like this:
I wrote up a profile for them and added some "automatic" behaviors and rules. I don't know how they will play in practice, but that isn't preventing me from sharing the proposed rules here.
Here's a screenshot:
Here's a link to the PDF on my Google Drive.
I'll let you know how they play out. With my luck, they will decimate my Space Marines! :)