That inspired this drawing:
Yes, you're right. You get to add the dirt yourself! I used some grunge brushes in Photoshop, but you could print it out and step on it, let the dog play with it, give it to your toddler, etc.
Now it's a beautiful sign to let folks know that you're not a poor housekeeper, you're just exceptionally charming!
(A note about the drawing: After having tried to color it in myself, I have learned that I need to do a better job of closing shapes so that the magic wand tool can be used. I promise, I'll try to make my lines meet on the next GCP.)