Here’s a quick and easy project that would be a great craft show seller. Cut from ¼” stock and add a magnet to the back. To use, keep the “Dirty” part of the sign facing up. When you start your dishwasher, flip it to “Clean.” Once the dishwasher is unloaded, flip it back over to “Dirty.” Now you’ll know with a glance if your dishes are clean or dirty (without the bother of actually opening the dishwasher).
You can watch to see how this was made here.