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This is a guess as I have thought about the same but not done it - you would need to know your html - and in the correct file for where the baner is (the path escapes me right now) where the code inserts the banner image you would need to change it to code which inserts your 2-3 images - I don;t know html - I am a real baby with it which is why I haven't done it . It would probably go something like - img source yaddda yadda alignment left;image source yadda yadda alignment right...but as I said I am only guessing. I suggest you find some sites that do what you want to do and take a peek at the source code...and do some research on html.
Hope this helps a bit.