This idea has been developed and deployed to Canvas
In the Messages section of Canvas, the way to compose a new message is to click on the icon of a quill. Some students don't even know what a quill is. And several of my students though the quill icon was a picture of a leaf.
A pencil is a standard icon on the web for "edit." Let's make the button easy to find by changing the quill to a pencil. (See attached files for examples.)