There are several synonyms for the phrase "are interesting to" that can be used to add variety to your writing. These include "captivate," "intrigue," "fascinate," "arouse curiosity," "pique interest," and "stimulate." Each of these words conveys a similar meaning to "are interesting to," but can be used in different contexts to create a more engaging and descriptive sentence. Using synonyms in your writing is an effective way to expand your vocabulary and express yourself more clearly and creatively. Experimenting with synonyms can also help you develop your writing style and make your work more interesting and engaging for readers.