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The ADFS Illustration Randomizer essentially selects an image at random from a folder stored locally on the ADFS server and sets it as the Illustration for the authentication form. It's basically just an easy way to make your users a little happier to login to that web app that they have to use every day.
You really should read this TechNet article to get the whole story, but to save a bit of time here's an excerpt:
We recommend the dimensions for the illustration to be 1420x1080 pixels @ 96 DPI with a file size of no greater than 200 KB.
This is just a recommendation though so just experiment with the file sizes and image quality. I've been running a 5MB file on there for over 6 months without issue, but all of my users are inside the LAN so with 1Gbps network connections and a small number of staff; a little old 5MB file isn't an issue. Just think about what is appropriate for your network.