Agreed, I have a grid of 4 whiteboards in my office, two are for actual white boarding, one is my open-ended todo list (sorted ideas) and the other is a done list of those ideas.

Anytime I get overwhelmed, I take a moment to review the done list and enjoy watching things shift from one to the other.

When friends come over I encourage them to draw me something fun on the done list which also helps me realize that life is about being happy with things you accomplish, not just getting them done.