Yes, I have. I have made several floating "corrals" from a small hula hoop and landscape shade cloth that I float the hyacinths and water lettuce. These serve both to keep my naughty koi from shredding the plants plus shade for the fish. Eventually, the plants fill the space and the koi can pull or knock out a plant or two. BTW, if you are lucky, you can find the hula hoops at a dollar store (seasonal item at Dollar Tree here). I have also made a floater with PVC and the shade cloth. If you do the shade cloth right, they allow for a deeper root area. I use thick fishing line to sew the shade cloth, etc. So far, they have lasted three summers.