You can tuck a smaller picture inside a larger one. Seller gets the value of 2 pictures listed but only has to pay for one. To put multiple pictures into a single image see these tutorials: IrfanView (not for MACs) is an excellent free program that lets you edit your pictures and do what you want. Here are two examples done with the program:
http://www.boomspeed.com/hpg/spikedInsert.jpg
http://www.boomspeed.com/hpg/spikedStitck.jpg
To download IrfanView go here:
http://irfanview.tuwien.ac.at/
Here's a tips pages for stitching two pictures together using Windows' Paint program.
http://www.bulls2.com/indexb/stitching.html
http://www.gg.caltech.edu/%7Eavalos/stuff/download/irfanview/editmenu.html#paste
