I saw a few people on other forums speaking about breeding blennies, like algae, and red/orange spot, and a couple of more too. Apparently you can sex these by eye, and if you get lucky with a pair...who knows. I cannot confirm this, it is just what I read.
I had a friend a long time ago that was breeding sexy shrimp, but this is even before I got into SW tanks. I wish I could get in touch with him now, I have quite a few questions for him. He was also able to breed a few other fish species, but I cannot remember which breeds now!
I do know that you can breed some cuttlefish, and some people have had success with a few species of Octopus as well.
I would personally be very interested in learning more about breeding blennies.
Chad