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.
Saw this at The Skillery. It's just wooden squares on the wall for decoration or branding. WHAT IF there were moveable though like on magnets or velcro. Could help organize brainstorming sessions that involve buckets. Like naming sessions. Colors are so amazing at keeping things organized.