In the Split View of iOS 11 you can drag sketches, doodles and even GIFs from an ordinary file right into your iMails and iMessages, or vice versa (open season for emoji-pirates). In other words: any file is to use like a custom menu for personal emojis or stickers – self made or individual captured.
And yes: Instead of a file, you can open this website and drag my sketches into your mails and messages. Try it with the following sample (free for personal use).
In the iBook, however, there are many more examples, meant as role model for DIY stickers.
News and updates at Tumblr:
For more advanced sketches
see next page
Out of the iBook Example 1: DIY Stickman than Sticker
For more advanced sketches
see next page