Adult Elite has Freaks of Porn. Watch Frankenstein fuck a French maid, etc.
Ghost Cash has a site called Beaver Bong. Smoking pot out of a pussy.
Fetish by Anna is AnnaO's fetish-latex-bondage site.
Top Bucks has a site called Fetish Hell which covers most of the different fetishes.
Sunny Dollars has sites like Bondage Ladies, LateXXX Girls.
Hell Kitten is a little scary Fetish/Bondage site.
Kumi Monster - Asian Fetish/Bondage
Not sure where you draw the line on micro-niches.