I've found a couple quite quickly and I've got some more when I can search them out....
Emirates A.380 PSG scheme

and though it pains me to post something with MUFC on it, Aeroflot A.321

and here's a Ryanair 737 with a temporary yellow and black scarf for Dortmund flights in May 2013 when Borrusia Dortmund played Bayern Munich at Wembley in the Champions League final, there were numerous extra football flights into Stansted on the day of the match and this came in at least twice

I'll search for some more when I have time - any more offers
Football's coming home! (or landing at an airport near you!).
andy