I really like Accordian on the Knitty.com site. http://www.knitty.com/ISSUEfall03/PATTaccordion.html
But I am not in love with the idea of ribbing an entire sweater. Also I would prefer if the sleves were the type that look like a baseball tee (KWIM?)
My ideal sweater for him would have a collar in the shape of Accordian, baseball like sleeves, zip up the front or maybe buttons. And done mostly in Stockinette. I would also love it if I could knit the entire body in the round, or at least most of it. I also like the idea of cables, maybe one or two up the front on each side.