We have put up our own Halloween logo and it looks like this for this year.

Which reminds me of Google and Yahoo's past logos for this day. Check Halloween 2004 and Halloween 2005, which also sports Jeeves.
Let's also not forget Cre8asites Halloween logo.
But did Google stop with the AdSense themes, remember the AdSense Halloween theme?
Forum discussion at Search Engine Roundtable Forums.

Comments:
Kim Krause Berg (cre8pc)
10/31/2006 08:24 pm
I was late getting it up this year, but one of our Halloween forums logos is up at Cre8asiteforums. It's different from the one you point to (forgot we had that one.) :)
Barry Schwartz
10/31/2006 08:39 pm
Yea, just noticed. Nice one Kim! Did you see Matt Cutts blog? He is nuts!
Mark Barrett
11/01/2006 10:54 am
What on earth does "Happy Halloween" mean? It is not a holiday or indeed a proper festival. This commercialization of the whole Halloween obsession is just ludicrous. It's just all hallows' eve, nothing more.
Jane Barrett
11/01/2006 10:55 am
What on earth does "Happy Halloween" mean? It is not a holiday or indeed a proper festival. This commercialization of the whole Halloween obsession is just ludicrous. It's just all hallows' eve, nothing more.
Barry Schwartz
11/01/2006 10:57 am
Honestly, Jane - I have no idea.