you need a good graphics editor, and you just create an empty picture, very large... then open the pictures you want copy each one and paste it into the empty picture, each one into a new layer then select each layer manipulate it move ect into the spot you want then once you have what you want save it into a format that accepts layers (.pst) so you can open this backup anytime to edit after you have this backup flatten it (merge all layers) save it into jpeg high quality format (choose low compression) .jpg put the file in a usb stick and away you go
takes a little training if you never used a graphics editor but it's not brain surgery.