Back in the 80's Graeme Davis and Jess Goodwin were attempting to create an army race unique Games Workshop, and they created the Fimir (based on the Celtic Fomorians). They're amphibian, weird, and have a really dark background.
GW oroginally planned on expanding them into an army, but according to wikipedia GW was worried their Grimdark backstory might turn off potential players, so they decided to axe them (apparently this was before retconning was in fashion).
Either way, there weren't a lot of Fimir miniatures made, and they're probably best known from HeroQuest.
This guy (all warrior Fimir are male) was picked up from the same friend who gave me the HeroQuest Elf years ago. I chose to go for a olive green skin, so I started with a mix of Thraka Green & Dark Angels Green, building up to a mix of Goblin Green and Catachan Green (I gotta use my old paint before they dry up). Finally, I mixed up to final last layer of Nurgling Green and a wash of Athonian Camoshade. The brass comes from an initial layer of Warplock Bronze, followed by a layer of Balthasar Gold. I then give it a wash of old inks (watered down black and chestnut ink), then layers of Runelord Brass and Mithral Silver.
The green & brass balance fairly well, and I feel supports the whole Celtic vibe. He's simple, but I like it.