You know them from twentyFIRST… just now waterfalls are for sale:)
Sculpted 20 prims only waterfalls in two patterns, with animated water. Everything is copy and full modify, you can copy, edit, resize or change your own terrain textures on it.
SLURL: http://slurl.com/secondlife/twentyFIRST/75/117/22
Flickr pool:
