Most photo editors can create this type of effect. Basically it involves "selecting" part of one image, then cutting and pasting it into another. I use Photoshop Elements 4.0. For the picture of my dd on Aladdin's float, I used a tool in PSE called a "magnetic lasso" to select only my dd from a picture I took of her playing. Then I copied the selection and pasted it into the parade pic. The selection then becomes a new layer in the second image, which can be moved around, resized, etc. It's pretty simple once you get the hang of it.