For the new update to come, I just wanted to propose an idea, with the assumption that the shaders in progress will be GLSL-based.
Basically, depth of field, but instead of a blur, far-away areas take on a watercolor effect, simulating real watercolor pictures.
I'm on my Wii, so I can't post pictures. I got the idea from Legend of Zelda: Skyward Sword, if it wasn't obvious.
