Apple has developed hundreds of new emojis but its 5.1 keyboard doesn't include those emojis. So I developed a new jailbreak tweak to enable that feature. It's available on Cydia store for just $0.99. You can use emojis keyboard just like native keyboard besides apps with root permission such as iFile or Cydia.
Head over to cydia and search emoji2 to download it while it's hot!!
http://wootylab.com/emoji2 in case you are unable to set up a new keyboard.