I don't have photos (because I am really low tech and too lazy to learn how to get my phone and computer to talk to each other). Sorry.
I have been using a standard boot tray -- about 24 inches by 14 inches or so -- for the dog dish, which is the size smaller than the 1-gallon one. Boy, I'm just a whole lot of almost-helpful, huh? Taller sides are better on the tray, but anything is an improvement when it comes to trying to reduce duck disasters.
Good thing they are such amazing critters because they sure make messes!