I have a couple with some Java fern on them. there about the size of a large grapefruit. I'm on Kaua'i.
http://www.plantedtank.net/forums/attachment.php?attachmentid=297938&stc=1&d=1396158427
http://www.plantedtank.net/forums/attachment.php?attachmentid=297946&stc=1&d=1396158474
LMK if you're interested.