TLDR; I created Skribul.
Facebook doesn't have an option to send drawings from its messenger app. I decided to amend that.
Skribul allows you to create a drawing and share it with your contacts.
With a bit of trickery, we can have messenger render these drawings as images and have them integrated into the conversation.
New ideas don't have to be groundbreaking, especially when it's just a bit of fun.