We found not one but three highly creative room dividers over the weekend.
Aakkoset is a highly functional furniture which allows you to use it as storage as well as a room divider. We love that it is available in various colors. Link
Nomad is a modular architectural room screen made of recycled double-wall cardboard in a wide spectrum of colors. The cardboard forms are assembled into free-standing, sculptural screens, temporary partitions or displays without the need for any hardware or tools. Link
We're not sure if you mind placing a wall of 'dried grass' inside your house, but we do like the idea very much. This space divider is mobile and modular, and comes in either wood or acrylic sticks. Link