In my 15 gallon tank, I kind of left the tank alone for a few months and when I got around to thinning out the other plants, I found that the non-substantial amount of moss that was in the tank before had carpeted most of the tank. Now I maintain the carpet by spreading out the moss evenly over the surface I want it to carpet (I use my hands to spread out the clumps of moss that form). I would guess you could create a carpet by getting a good amount of moss to start with and spreading it out over the substrate you want to be carpeted.
The moss in my tank is a mix of java and christmas moss. If you want a carpet, I don't think flame moss would be a good option, considering its vertical growth pattern.
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