Code-In students have created amazing work using p5.js (http://p5js.org/) to make online drawing apps:

https://jamesonnen.github.io/

http://idarbek.com/p5/

(also, a neat intro guide: http://codein.namanyayg.com/blog/p5/)

Now, after seeing this projects, what do you think could be a different way of making "drawing" inside the browser? You don't need to be restricted to using lines, you can think of images, sounds, etc. Also what other drawing apps people have created so far? Which ones you think are the most interesting? What about collaborative drawing (i.e.: many users drawing on the same canvas)?

So if, after this research phase, you have a new idea you would like to implement, just let me know!