Yes, I do notice those Googles doodles that changes with occasions. They are usually pictures, scenary or decorations.
The one I loved most was the 30th year anniversary of Pacman game as it was so unusual & interactive (not that I love playing Pacman to that extent). It was fun though trying out the Googles version. This only lasted a few days and news on the internet stated that companies were losing $1m or more in productivity as employees were all playing Googles Pacman.

Then because many people love that Googles Pacman so much, Goggles brought it back as a permanent sub-page
here.
Goggles also had some usually doodles like the Scooby Doo short comics scenes and the recent one where there were various fragment pictures and it enlarges to the full picture when the mouse overs over a fragment picture.
Chroelle wrote:And do you know that if you press Insert Coin (Where the "I feel lucky"-button is normally placed) you can play as Ms. Pacman as well, so it becomes multiplayer?
Go try it out!

I never knew about the "Insert Coin". Just tried it, that's so cute. Played Pacman using my right hand and Ms Pacman with my left hand and managed to clear 1 level without losing any lives for Pacman & Ms Pacman.

Well, that's what I do (use 1 hand each for each player & play at the same time) when I want to try a 2 player game & there's nobody around to help.

Doing this is not so fun as the concentration splits. It's still nicer to play with someone else.
Pacman was not my favourite. These Pacman type were my favourite:
- Ms Pacman - because of the bouncing fruit
- Super Pacman - because it is gigantic and cute
- Hyper Pacman - because of the power up (speed up, jump, freeze time, shoot etc)
- 3D Pacman - because it is 3D & could jump over ghosts