Usually, when I'm bored, I watch other people doing different challenges but not do them by myself. Youtube is the best source of challenges. Sometimes the challenges that I see there, like the
24 hours challenge, we repeat them with my friends. Not because we're bored, just to have fun. Watching artists creating art is on my list also when I'm bored. This is a great source of inspiration also and the most productive activity I can do when not wanting to do anything.
Bookmarks