Edit edit: Yeah, it's in "misc". Oh and "watercolor.png" contains the gradient that is used for color, I believe.
Actually, that png file is an unimplemented file to change water color according to biome, similar to how the grass color is changed according to biome.
Anyways, I use the Wayukian texture pack. It's a nice looking 16x16 texture pack that adds a slightly darker feel to the game. But there are few HD texture packs that I can stand. It's just that the blocks are so detailed that having a mixture of them kind of looks bad.