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 don't really have a clue how to put custom sprites, custom blocks, patches, ExGFX, tools, or custom music into a Lunar Magic file. Are there any step-by-step instructions for these processes floating around anywhere? (I have Windows Vista, if it really matters.)