I think it is such a fantastic way to add a personal touch to your Save the Date- it shows off your personalities, it is a fun way to relax and spend time together before the wedding and it is inexpensive. Here is some inspiration from other couples-
Photo by East Hill Photo
Photo by Steep Street Photography
Photo by Adrienne Gunde
This is a sweet idea if you are planning a destination wedding.
Photo by Lauren Ross Photography
This is my personal favourite because I absolutely love Alice in Wonderland!
Photo by Trever Hoehne
(Sources: http://www.littlemisswedding.co.uk, http://tamrynkirby.blogspot.com and http://inthenowweddings.com)