I have been working on a world (tired of the standard earth-like worlds that is common in games) that is filled with floating islands (skyships/airships or magical/natural fly ability used to get around), cloud formations (containing creatures of the deep that can unexpectedly attack), and flying aquatic fish (the idea of a kraken attacking ships as they move from island to island) through the use of a magical organ/gem instead of having wings (using the winged creature template form Savage Species).
I can't make up my mind of including any aquatic race (such as merfolk) that can fly as the flying fish do.
Would love for any and all thoughts on the matter