For images where a character is in one of the poses used for the Vocaloid software's boxart.
[1] Wikia image: http://images.wikia.com/vocaloid/images/4/49/Ofclboxart_cfm_Kaito-illu.png (Dead link)
[2] Wikia image: Megurine Luke
[3] Wikia image: Meiko
[4] Wikia image: Utatane Piko