Saving a JPG from pictures.

I have a program that randomizes items for a game, and what I would like is to take the pictures and create one picture from around 7 images. Is there a way of doing this?

This is my program:


And what I would like to end up with is something like this:


I've looked around and couldn't find an answer. Any help would be greatly appreciated. Each image is a separate.

-MattTheHuman