We're in the process of picking a rug for the nursery. As much as we love the hardwoods throughout the house, we want a nice soft spot in the middle of the nursery where the kid can crawl, play, etc.
We're probably going to go with a green to 1) add a splash of color and 2) make it look a bit like a grass floor in our travel-themed nursery. And we're probably going to go with the one on the right. It's a bit of a shag, which keeps with the mid-century look and feel, and it doesn't look like AstroTurf.