I stumbled on this via the Maker blog, the video looks like someone waving them around not having them float on water, but it would be pretty awesome looking to float a bunch of these around your hull at night and MUCH better (IMHO) than putting more holes in your boat to install those lighted through-hulls.
This could be especially awesome on say the 4th of July or on a day to day basis on your anchor buoy.
Bubble Bobbles are water-resistant floating globes each imbedded with a tri-color LED. Tilt sensors are placed in each Bubble causing it to change colors depending on which direction it's tilted. Used in multitudes Bubble Bobbles can be placed in a pool or lake, causing ripples of colors with each splash and wave.
(see movie)