I'm not even interested in what this guy is going to do. Seriously, it's ALL been done before, SOOOO many times. Just save yourself the time, and don't do it.
I don't really get the point in doing this. First, I don't see why people need a whole resource pack for one flower changed and some textures changed from dark green/brown to a lighter green, assuming that's what he meant by all grass and leaves being green. Second, why would anyone want to listen to parodies (most of which I think are dumb any way) instead of Minecraft's original music?
and please dont forget that for the music parodies you need permission of the owners and proof of it, else its illegal.
http://www.minecraftforum.net/topic/1972371-13w36a-roses-for-poppies/
Also, why make an announcement thread >.>