large Foam core boards to brainstorm ideas. Ikea Benjamin stools hacked to keep the boards upright. They can still be used as stools when needed and are also great for creating temporary walls for project spaces.
Room Divider made from old doors. Wheels make it easy to move. Click the pic for many more DIY home decorating ideas. -- this would be a good idea for a studio apartment to separate the bed from the kitchen/living room area