What about do what I did. I used cacomba in strands, rubberbanded them to pieces of pea gravel and dropped the rocks behind a piece of driftwood to give a curtain effect on the back. However I will tell you that I started out with one piece and have pinched it back to now about 20 strands look like it is growing from the back.
Bunches of tanks.
Reef, Planted, vivarium, terriarium, salt.
I worked my self up from nothing to a state of extreme poverity