Don't know. Wish I did. I would like something like that. Hopefully somebody will be along to help us out.
In the meantime, make up your own skill stretching projects. Think of random things. The more random the better.
Things like:
Use some gaffers tape or a big rubber band to lock one of your zoom lenses at a fixed focal length. Force yourself to learn how to work with that focal length. Use it until you know what it does. Then pick another one. Hint: Try getting out of focus areas with your widest focal length.
Do the same with the aperture scale. Pick one. Use it until you know what it does. Then pick another one. Hint: Wide open is too easy. Try getting out of focus areas at f/8.0. That may or may not be easy.
Pick a song. Any song. Try to come up with visuals that relate to the lyrics.
Good luck.