This is such a cute and easy idea! Would be perfect for those of you with young kids (Craft table seating anyone?) or teachers of probably kindergarden to first grade for seating. You can also have the cushion removable and put supplies and storage inside.
Add an icon so students sit at same spot for small groups every time. Eliminates time wasted due to seating arguments and reinforces a skill- shapes, colors, etc. Can change the skill throughout the year according to what you want to concentrate on and keep it interesting. :)