NW in BKK, stickers its passengers with a circular NW sticker for its one flight a day. I believe SIN has this also.
UA also does this in BKK
Bangkok Airways uses a stylized airplane in varying colors as Letoile states for connecting passengers. International connections get one with "CIQ" on it to indicate that the passenger has cleared immigration at the origination. Originating International PAX get stickers so that they can be identified for lounge access in Bangkok.
Air Asia has stickers.