Hi Dan -
I have some blue sponge growing in my 65 gal tank, but the colony is not quite large enough yet for me to feel comfortable messing with it; however, once it is bigger, I will definitely be happy to share it with you (assuming you haven't come up with any by the time mine is ready).
I also have a cool looking bright yellow sponge in my Eclipse6 that might be ready for sharing in a meeting or two as well, if you're interested.
-Nate