You do not have to stick to the prompts! There are thousands of worlds out there, we cannot possibly list all of them. But go as wild and crazy as you want, think outside the boxes. Whatever AU you come up with is an AU we want to see! Content does not have to relate to the prompts or other themes.
Some prompt ideas to get started:
There is no deadline! Don’t feel pressured that the only opportunity you can post things is only for the prompts or week. The dates are just a guideline, if its late, thats no problem! Better late than never. Just remember to use the #FrozenAUWeek tag so other people can find your content!