cocktails you've invented that worked or didn't

I made myself a delicious cocktail the other night, which deserves perfecting. Old Monk rum, parfait amor, and lime juice (i might try a dash of bitters in the next go round - think that would work there?). the vanilla/floral notes of the parfait amor pick up the vanilla/caramel notes of the old monk nicely. Only problem is I don't know if I could ever serve this to anyone else as its the color of swamp slime.

any ideas?

any stories of cocktails you've created, and did and didn't work in them?