I LOVE that look as well. Thats what im going for!Wouldn't hornwort be another good plant to use since it grows and self replicates so fast, that and since it doesn't need to be in substrate to grow either?
Also that is a beautiful pond ya got there. Love the lush unkempt plant life. Really brings in a sense of the wilderness right into your own backyard. Can't wait till it's warm enough for me to start working on my pond.