This can be really fun for you 3d modelers out there. You could even use Blender or any other 3d graphics program. Some days I just play around in illustrator creating new masks. It is a great way to waste some time in the day.
With the free stereogram creator at EasyStereoGramBuilder.com You can easily create custom background images, Posters or whatever else you want. I create my background images in photoshop. Then I create the mask in illustrator. You can use a logo or create your own custom images.
The one above is one I made with one of their stock masks and a background I had laying around.
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