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I have a form where the user uploads two images, and based on them I generate about 10 other images ( using PIL ). The thing is, I want to show an HTML page that contains all the generated images, but I would like not to have to store them on server side. Is this possible?
You could use the Data URI scheme. The examples section on that Wikipedia article has some nice things to start with. What you need then, is to convert the binary image data to base64 so you can include it on your page. Fortunately, there are scripts available for this already.
Browser support seems okay, all major browser have no problem with it. For IE, it is supported from IE8 upwards (with IE8 having a limitation of 32KiB for the URI size).