Continental has the Peter Max 777.
US Airways has the new heritage jets with liveries of older carriers that combined to form the present-day US Airways.
Lufthansa has their retro jet.
All members of STAR ALLIANCE have aircraft painted in their Star Alliance livery, with the alliance name in billboard letters and either a black or white tail with the five-pointed star on it.
Many LCC's have special logo-jets with billboards painted on the aircraft.
Virgin Blue has a special 737 (their 50th) I believe, painted in the opposite colors than all the other ones.
Malaysian Airlines have a 744 and a 772 painted in special Hibiscus schemes (red and blue, respectively).
Those are the ones off the top of my head, I'm sure there are MANY more.
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