Thanks for the entries, Brendan! The elephant is really fun!
Instead of Premium Casual Games, could you see if you could work in Little Games. Big Fun! as the tag line? Also, have you tried stacking the words mumbo/jumbo?
On #6, the elephant is a bit too realistic, the cartoon quality of #7 is a little more our speed. If this became a mascot, it would need to be a friendly/fun/cartoon-like character.
One other thought--if we tried to contain the logo MumboJumbo inside the shape of the elephant, that might be an interesting route. See what you think about playing with a more compact concept with the logo/character.
Also, feel free to play with the color. The suggestions we provided were just to get everyone started, but you can explore color further. :)