Contact form with drawing pad ¿?

Hi ppl. I am building a web site where I need to put, in the “contact” section, a “drawing pad”. I mean, there will be a contact form, but the client also wants the site to have a drawing pad, so the visitor can draw his/her requirement and submit it with the rest of the form data.

Some ideas of how I can do this?? Is there any tool or resource you know? :q: :puzzle:

Hope you can help.