Alright so I've discovered that I can't make my engraving trick work with other colour schemes. At all. Ever. Learned some things about how colour works in DF tho, which makes it worth the time spent on that! Here's the two edits that did work out:
Left is the same as before, without the engraving trick. Compatible with colour schemes that don't use pure black, looks the same otherwise.
Right is meant for worldmaps and embark screen - if it gets used as a default tile in maps, it's got white transparency on it. 5% opacity as opposed to 2% in the first version I posted. Should be pretty easy to mix and match to your heart's content, also has some non-map tiles for consistency.
I ended up keeping it, I haven't tried an evil ocean embark before. Can't wait to get eaten by zombie whales
Groundcover in good regions looks pretty neat with the maps tileset, but I haven't found an evil region with non-standard grass to match. Will post screenshots when I do! (the evil grassland northwest of center has normal grass. And beakdogs. Lots of beakdogs. I may have gotten carried away with playing instead)
carnivorn, are you okay with your tileset being bundled with Lazy Newb Packs?
ngl I'd be thrilled!
7 Aug 16:
Edit! Finally found an evil biome with wormy tendril etc. while attempting a good/evil boundary embark. Thought it'd be a great example image, took two pics of the same spot a few frames apart.