Plant Identification?

What plants are used as a "carpet/grass layer" in the bottom picture? I might attempt to recreate the grass-like look if only I could find out what they used!

p.s. the picture is not mine, and i am not trying to take credit for it. i was just inspired and need a bit of help

Also, what kind of plant was used here? Again, as the grass layer. Thanks

I think in the lower picture you glossostigma. The upper one is difficult to see as the picture is so small. Echinodorus tenellus is regularly used as a carpeting plant.