Airline's around the world occasionally paint their aircrafts in special liveries to commemorate an occasion or specifically for marketing and publicity purposes. Below is a list of airlines with special liveries taken in the past.
PK-GMH (Skyteam Livery)
KLM Royal Dutch Airlines
PH-BVD (Skyteam Livery)
(60th Boeing 737-900ER Livery)
(100th Boeing Next-Generation 737 Livery)
(150th Boeing Next-Generation 737 Livery)