If you to go your local hardware store, you can grab some melamine or just regular white thinboard for cheap and cover your wall with it. Grab some dry erase markers, HUGE place for mindmapping/brainstorming/whatever.
I write big and kinda messy, so regular 8.5 by 11 sheets aren't big enough for me, so went and got some 11 by 17 (two letter-size sheets stuck together) sheets. They're big and they're awesome.
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