Left to right.

Ouran High School Badge

Shinsengumi Headband (hiate)

Shinsengumi Flag (version 1)

Sannosuke's "aku" (bad) symbol from Kenshin

The Papillion Mask from Busou Renkin
(Koshaku Chono wears it, dear gawd dont cosplay his outfits!o_O)

Four Gods Heaven and Earth Book cover - Fushigi Yuugi

Chudley Cannons Quidditch Patch, non-official - Harry Potter

Hogwarts Crest, official - Harry Potter

Kitty in the House logo, official - flower shop from Weiss Kreuz