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Here's mine.
Poison is my favorite type and has some of my favorite designs, so this is more driven by my own personal preferences then a coherent theme, but it still sort of works, in that a ghost, a climbing aboreal/cliffy creature, a pitcher plant, an aquatic creature that blends in with plants, and a scorpion all fit into a swampy area with ruins. (Nidoking is the outlier).
As it applies to the "Mesoamerican ruins" for the gym design, the cyclical and complementary nature of life and death (what with the world/people being created via the sacrifice/blood of gods and the destruction of previous worlds, and in turn existence is sustained via regular sacrifices) is a big deal in Aztec, Maya, etc philosophy, so in that respect poison represents decay and renewal (see Xipe Totec), though I guess a Grass/poison gym (like Sage's) would represent that better, as I said this is really more just "shit I like" retroactively trying to fit together then anything else.
However, my art skills (at least making something from scratch) suck ass, so the badge design here shows that. If an artfriend wants to try to make it not suck let me know and I can explain what i'm going for.