Objects: Play Blankets by K9DB from Mod The Sims.
These blankets work like the Play Tent, but they also have the footprint of a rug, so your sims can walk over them or you can place things on them, without routing issues. Just keep the front of the rug clear so your sims can use it.
There are two versions, fluffy blanket and quilted. They are separated in the catalogue because they have different bump maps.