I really like the Geico lizard being apprehensive about insuring the brown m&m. The humpday camel spot with Ms. Brown is even funnier. Great win-win in this positive mash-up:
http://adage.com/article/news/m-m-s-geico-s-characters-star-tv-ad/291971/
Obviously humor and multiple spokes-creatures help Geico be successful.