This powerpoint has 90 days worth of journal questions. There are a decent amount of personal questions, creative questions, and ethical questions. There are no length requirements included, so that is something you can require of your students. You can also modify this document as you wish.
There are some repeats, like: Draw something. Tell me a story. Make up a joke.
Just because I have found those never get old and students tend to really go all out with those.