This one is a bit more of a one-trick pony than I'd hoped, but it's a cool trick, so I'm posting it anyway.
Makes everything look green and toxic, in a vivid comic book/poster style. Likes gas masks and skulls.
For character renders, set weight to 1.5 and use (toxic:2).
This LoRA is pleasant but unpredictable when weighted negatively. See my other image post below for examples.