One quick simple idea for a pool float design that looks fantastic, easy to do, will float, and minimal fuss and product.
Take several different sizes of styrofoam wreath rings......Glue them into a nice shape...either a cross, triangle, line, etc. with lengths of rivercane or bamboo. The largest ring is in the center. PLace a smaller circle of styrofoam - not a wreath - and center that with peices of bambo or rivercane.
Wrap the styrofoam with Green Ti Leaves ( remove the center spine so they will be flexible )......Or really any type of broad leaf ( Aspidistra, Ti Leaf, Spath leaf from older peace lilys, etc ) Then Glue a dish with Oasis On the Center Pad and arrange a linear design using tropicals ( Doesn't have to be a large design or loaded with tropicals unless you just want to )
See the attached illustration for a diagram of one possible placement.
Basically, the outer rings act as outriggers to help balance the center area where the biggest amount of weight is. The larger the design, the more or larger outriggers you will need. Just experiement and have fun with it.