Ya know, I really haven't done a lot of dress up theme ideas for kid photos, however a couple of years ago I had the most amazing experience that I cherish to this day. I hired a photographer named Paige Elizabeth to come over to my house and take photos of my two boys. I had seen some of her work online and worked with her a bit on a local newspaper. I had not met her in person so when she came over, she spent a very short time talking to me then got on my floor and started talking to my kids like they were the most precious things she had ever met. Basically she spent a few hours following them around, talking to them, playing with them all the while taking photos. Two weeks later she sent me a disk of the photos and a slide show put to music. I was so touched by the images she captured I absolutely bawled my eyes out while I watched the slide show. To this day I feel so blessed that I found someone that was able to capture the essence of my children so perfectly.
I ended up presenting the slide show to my husband for his birthday and got to enjoy another special moment when he got a tear in his eye as well.
Paige is pretty expensive but I have never regretted having spent the money and she gave me a release to print the photos as often as I wanted.
If you want to check out her stuff go to www.paigeelizabeth.net
Good luck with your photos.