i broke up one of my moss balls and it looks like crud now. i haven't attatched it to anything although i have been thinking of it since i saw someone who had done it and it looked pretty cool. i like them better when they are round though. if you are gonna do that i'd look for some deformed ones and see if i could get them at a discount.
I accidently sucked up my marimo ball and it ripped. tons of dusty water came out the center. it was a funny shape, so I broke it up in pieces. some pieces actually grew back together. but they are slowly growing and forming a ball again.
I attached some javamoss on a piece of drift wood, and its growing now, slowly