Rick, I'm going to have to get a picture of a local persons pond. They have the best cover I have ever seen on a pond. The nice thing is the sides come down on it for the winter. The problem is it cost them about $3,000.
My wife wants me to build a matching cover of our patio cover. First I don't have the time to build it right now, and I'm guessing it will not be cheap the way lumber is right now. So it looks like it might be sails for me for now.
Here's a picture of the pond before we added the liner and water.
Sorry I was just joking. That's not my pond, here's two pictures of my pond. I think a few of those shade sails would look nice over it.
Tom