like a big part of you, I'm also fan of Colors ^^. World End is also impressive !
As I just said as a comment, I also love "I will" and "Love Dub", you can find them in the singles for both of the opening I just quoted :)
tsubasalover said: I heard DAYS, COLORS, Answer, and Fuyu no Amaoto. It's hard to choose on fav. because I like all of the songs. But I think I like DAYS as anime opening and PV, COLORS for song, and Answer for song.
EDIT: I also like WORD OF THE VOICE (PERSONA -trinity soul- opening 2)