Floatsonline have the peacock ones that i was talking about. Not hard to make, if you can find the quills.
Have tried the balsa floats, and they do work, but if they get a crack in the balsa body, they soak up water like a sponge.
Peacock quills, you dont have to worry about them soaking up water, the inside part of the stem, is kind of like styrafoam, and will not take on water if cracked.