I've seen an algae that grows in our tree and I love the texture... I want to put in in the pot... together with a plant... but what kind of plant should I put? can you help? thanks

algae or moss maybe?
If it's moss, maybe a fern....

Or a lichen which is a combination of a fungus and an algae.
http://en.wikipedia.org/wiki/L...

There is a 70 cent low-pressure m ini-mister that works off the water pressure in your taps, if you need to keep moss humid indoors. But you would need an intermittent timer or you could just spritz it with a spray bottle as easily.

http://www.dripworks.com/produ...