I've been playing Minecraft with a texture mod lately - I like it over "classic" minecraft on many levels, but I find there's still aspects of it that bug me, like this:

The sprouts of melon seeds are invisible.
(Here's a comparison with the default textures)

Where, exactly, are the various stages of melon growth stored? Or, if there's not multiple textures for melon sprouts, how does Minecraft go from the seed-like stage to the fully grown texture? Is it just a matter of making the melon sprout textures taller?