well, here is one example... I have some right now, but not enough to share I think... When I started my fuge i had some lighting problems and lost most of it, it's coming back though.

http://www.saltcorner.com/sections/g...tryocladia.htm

a similar species I have had crop up on my liverock:

http://www.saltcorner.com/sections/g...odichotoma.htm

you can go to live aquaria or any of the larger online vendors and find awesome specimens...

remember, too, mushrooms are almost bulletproof.