02-18-2014, 12:43 PM
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just a guess, ... search for the various types of moss & other carpet plants
i'm guessing carpet plants as once they are free from the substrate under them they have no support to push up on.
ganted many plants stay low only because they are getting sufficient light, if they feel a need for more light then they stretch up.
i am reminded of one person who had a floating island in the tank, foam or plastic or whatever, they he covered it in whatever plant or moss or whatever it was ...
the shape of the 'floating island' base (plastic or foam) could likewise be your start, ... if all you're interested in is a shape, ... for the true hanging visual seen in a forest that's kinda see-through as the moss hangs down, ... good question, it's not like most plants to hang when the alternative is to grow towards the light..
in your shoes, ... i would look into various types of moss & begin some trial & error, ... maybe my guess about moss creating more of a round or egg shape as it grows isn't going to ring true for reality, ... who knows, ... but i would start with a low light demanding plant (regardless what type you go for) so it's not tempted to want to grow towards the light and gravity can do the rest.
failing that, ... trim and prune your moss into the shape you want as it grows :)