You can create a free canva account at www.canva.com. When you login, you will be able to save your designs and download them to submit for the assignment.
You can also use this link to create something free: CLASS LINK
I created a template for you to use in Canvas for your note card. It looks like the picture below on the left. But you can edit it with pictures, colors, text boxes, etc. using the menu to the left (in black).
Template Available here:
I started by playing with the "elements" section on the left menu. The template when you click on it will look like the picture on the right. And you will be able to edit it then. There are lot of things free on Canva you can use to make your project (although you can also pay and get more editing options--no need to do so though).
Then you can upload the file you save on your computer into the Canvas assignment page so you can submit it.