Assignment/Discussion/Quiz Banners

Community Novice

Hello,  As I was creating my first Canvas shells, I created banners of my own for discussions, quizzes, and assignments.  Then these other banners started showing up in my images that were much better than I was doing.  I want to use them, but I can't find the source to make sure they are not copyright protected.  Here is a sample:

Practice Banner

Can anyone tell me if these are free to use?