a J-pop song cover for to an audience new to J-pop

[TofuBunny]

So, my school is having this event .. and me and my class are doing a culture music thingy .. I got the Japanese girl role obviously .. and since I can't get a Kimono or a Yukata .. Im gonna wear an outfit that represents the "Modern Japanese teenage girl" (the outfit will be inspired from a J-Fashion magazine) .. and im gonna sing .. Im having trouble with the song choice,
should I do Ayu's GREEN .. since it has an oriental feeling ?
or a J-Poppish song like the Hello! Project material ? or something else ?

Im really confused at the moment .. any help will be appreciated =)