Tip: If you give a Muncher tile custom graphics, it will still act like a coin when a silver P-switch is active, whether it looks like a coin or not. So make sure to use ExAnimation if there's a silver P-switch in the area.
I actually have in my work space a folder which contains screenshots of what each graphic looks like in YYCHR. So I just scroll through a bunch of images and look for what I need. However this is also very useful.