brilliant idea and perfect execution. Consider putting "Made by Yarrly" text under Yars( I would like to call pictures as Yars) and there could be a paid option to remove it.
Haha! Nice monetisation idea! We just have 'Yarrly.com' - going for high viral-coefficient first, but not going to overpower people's output with advertising/watermarking --> USER FIRST! ...but we'll keep it in mind!