Creative visual management can be found in any environment -- and it doesn't cost anything. At the end of dinner last night, the waitress brought the check and carefully aligned it with the edge of the table. She said, "When you're ready to pay, just turn the check sideways [so that it's perpendicular to the table edge] and I'll know to pick it up.
My dinner companion and I could continue talking without the waitress hovering over us, and she could spend more time attending to other customers.
Simple. Elegant. The best visual management (and the best tools, in general) always are.