The best accessories are the ones that mean something to you. So bring items that are a part of your story, whether you love coffee in the morning, enjoy reading a good book, or ride horses (I mean, please don't bring the horse, maybe a hat will do). Items like these make you and your personality shine through even more in your photos.
Some ideas for items for you to bring to your shoot:
Mugs
Books
Jersey of a favorite sports team
Favorite pieces of jewelry
Something that highlights a hobby of yours
Favorite piece of clothing (dress, sweater, jeans)
Favorite pair of shoes
Hats
Glasses
The shoes you wore to your wedding