>>96043947
you could think about why they're brown and black in the first place. Probably to blend in with their environment right? But a base the same color would be boring and look bad. So something contrasting, as other anon said your browny orange would be most contrasting with a blue. But not something too elaborate that it draws your eyes away (or maybe you want to do something elaborate thats cool too). So you could have a brown/black environment that then has had snowfall to make it fit both those criteria. Or a brown muddy jungle maybe mangroves, that can have those blue-green and blues to contrast.
And all these choices are constrained by what you can do feasibly. If it was me I'd probably do snow since I can make fine enough snow nowadays that doesn't turn piss yellow on me with polyfiller (and paint it's shadows with vibrant blues). And go for something like those cool geometric icelandic volcanic rocks maybe made from sprue. Or just normal rocks. Maybe some moss. That's what I could pull out right now with no purchasing of some 3d printed plants and shit which is what you probably would want for a jungle base. I also think the alien coral bases people make are really cool but would be too vibrant for that mini and would draw your eye away I think