Ermm...the PV is really stupid. There's a bunch of random things that don't at all fit with the song....like singing on a microphone thing, and that weird beginning...O.o It's like somebody just wanted to do those things in it...
But the song is okay, I think it'll grow on me. It's not as fun as the last songs...just a bit calm.
I predict the next color to be purple! I can't think of any other colors...they already used the primary colors, and green, so purple MUST be next, or orange, but that won't seem right, since orange and yellow seem alike, but purple looks completely different!