Compose one picture from parts of several photos
Microsoft has a free program to create a composite image from parts of other photos. It is called “Group Shot” and is described thus
Group Shot helps you create a perfect group photo out of a series of group photos. With Group Shot you can select your favorite parts in each shot of the series and Group Shot will automatically build a composite image.
Although Microsoft seems focused on group pictures, there’s seems no reason to limit it to that. However there are restrictions. The Help File says
Group Shot creates a composite image from a series of photos. The photos must be of the same scene, taken from the same point of view within a short period of time. The application uses regions that you indicate to build a composite image automatically.
Go here to download.
Found in the Neat Net Tricks Newsletter