These are all Canvas-friendly widgets:

Growth Mindset Cats ... and Growth Mindset Videos.

H.E.A.R.T. = health and happiness, empathy, attention, reading, and time. Plus H.E.A.R.T. videos too. There are also specific widgets for the Reading and Time items.

Freebookapalooza. Plus these specific widgets: African, Asian-Pacific, Biblical, British-Celtic, Classical, European, Indian, Middle Eastern, Native American, and even more books.

Indian Images from the Ramayana, Mahabharata, and more.

Myth-Folklore Images. From the online UnTextbook for my class.

Writing Inspiration plus Writing Humor.

Student Storybooks is an example of how to create a project archive widget.

LatinLOLCats. From my days as a Latin teacher!

Proverbs. Proverbs from around the world.

Aesop. There is a widget for Aesop illustrations, and also a widget with very short Aesop's fables, including the texts.

Martin Luther King. Quote posters in honor of the holiday honoring Dr. King.

Random Widget Item: press reload for more.