Quite a few years back there used to be a CG artist who went by
PaPa'n and had a site named
Boobs Frontier. He really liked nipples, and drew some of the best nipple-centric stuff I've ever seen- also a lot of very, very weird things like amputation, and extreme multi-breast, but thankfully those were in a separate gallery.
His site disappeared a long time ago, and unfortunately trying to search for his art elsewhere will just get you millions of instances of the word 'papa', but there is one sample of his work that remains easily available: he once collaborated on an illustrated story at the BEA, and it now resides at The Overflowing Bra:
CowGirl
It's not much, but it's
very well done.
EDIT: Holy Carp!
Boobs Frontier still exists! I've never tried using the
Internet Archive Wayback Machine before, but I thought I'd take a shot in the dark for this. They've got what looks like the whole site, backed-up repeatedly until its last sighting waaayback on Friday, February 13, 2004:
Boobs Frontier @ Archive.org
There's a few things in there I'm going to save to my hard drive this time.
EDIT THE SECOND: Uh... holy carp again. Yeah, you remember how I said that PaPa'n drew some weird stuff? Well, it's a lot weirder than I remember it being. Maybe my mind blocked it out or something. And the reason I know this is because the different galleries aren't as well-separated as I'd remembered either. There's still some great things in there, but... be warned. Just, be warned. And don't click on the thumbnails unless you're
really sure you have to know what the image description is talking about. And
for the love of God read the image descriptions first!