At the end of the year, it is sometimes really helpful to have a few mess-free classes. Here is an extensive collection of videos for the art classroom. Most of these are short clips, but there are a few longer videos to use if you need a good sub lesson or to engage students while you are cleaning and organizing!
I have previewed nearly all of these, but be careful! There are a few videos that show brief nudity. Also, YouTube advertisements are not always appropriate, so check out the videos before showing them to your students. Good luck!