I printed out some writing prompts I found on various sites (and this very handy list of synonyms for easy reference) and the prompts were totally dissed by the girls. I completely understand, most of them were pretty lame, but what it did do was get them excited to write fiction using their own ideas. The reaction against something can be a great creative spark. I'll take it!
For thinking of character names, this baby name book comes in handy. Ballet stories have a lot of characters and many names are needed quickly. This book helps that take a lot less time and keeps the names fresh. The synonyms list is a huge surprise hit, they have it on the table all the time, so that's good. We have a few thesauruses, even a small pocket sized one, but printing out this list and having it big and right in front of them makes it easier for them to reference.