Pillow moss grows in a "mounded" fashion and what you are looking at in that picture is the result of separate mounds growing together. The end result is a series of rolling hills (well little mounds) in the viv - not a nice flat surface. But it is quite nice.
Selaginella as noted is a club moss and grows to a greater height than true mosses and while it can cover a given area, it doesn't have the same ground cover impact compared to true mosses. I have both Selaginella (several kinds) and either tropical sheet or tropical pillow moss in a number of my vivs and they all work well.
Keep in mind that any viv setup will need to "grow" into its final form, whether from the perspective of the plants growing in, moss layer settling in, etc. Use your imagination of how it is likely to look long term (and there are number of pics in peoples' galleries here) as opposed to being discouraged that a newly set up viv looks a bit barren or raw. Good luck.
Bill
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