ASCII Art keyboard is a third-part keyboard application for iOS 8, after you activate the embedded keyboard, you can type ASCII character emotions freely like using the system keyboard.
It also works fine in iOS7, you just need to copy it.
Q: How to add 'ASCII Art Keyboard' for iOS 8 ?
Go to Settings > General > Keyboard > Keyboards.
Tap Add New Keyboard, then choose 'ASCII Art' keyboard from the list.