Not sure about "seeding" something like that, but you could always carpet a plant...something like glosso, dwarf baby tears, dwarf hairgrass..Try looking those up and see if that is what you are talking about
If you do those, I believe they are more high tech...not sure but you might want to check on that. I know that the dwarf baby tears are, not sure about the other two.
Edit: you could also do that kind of thing with java moss so you wouldn't need anything high tech, but I think that stuff can get pretty messy for carpeting