As mentioned in the Documentation, D2L Brightspace has a image library that teachers can use to set course images on a whim, including having those images be tagged (i.e. searching skeleton results in the library pulling images of a skeleton).
I really enjoy the selection of these images from what I've seen as a learner taking courses with Brightspace and was wondering, assuming the images are royalty-free and/or creative commons licensed, what image library (or libraries) does Brightspace source from for their image library?