Welcome, Mike, glad to have you here.
Last week I built a set of screens to cover my pond. Built of PVC pipe frames, and then I attached chicken wire, and spray painted everything black. Lightweight, easy to move, not too noticeable, and I sure hope it will keep the fish from jumping out, and the 'coons from digging in.
As far as plants go, there are people here who sell lilies and other plants. Hopefully, someone will see your post and respond soon.