Images on Forms: Is it possible to have two or more images in the same box?

Not presently but what I can suggest is that a graphics program be used to combine the images in one and then use the resulting collage as your image:

http://youtu.be/iMrSkUzg7ws

Alternatively, you could also shrink adjacent image boxes and have them horizontally aligned. Right-click the first box and then click "Shrink" and repeat the process for subsequent images as illustrated below:

(Click screenshot to view live form with all three images aligned)

Hope this helps.