I have 1 from Andrew W.K. that takes up the entire photo.

I probably woulda never kept 1 from him, but it was so cool that he put in that effort, I did.
Generally I find personalizations annoying. I really only would keep a personalized one IF they actually put in the effort to write something interesting on it.
If it just says "To Name. Signature" Screw it, I'm wiping the personalization... even if I am keeping it.

Here are my favorites:

http://www.flickr.com/photos/kayler00/8 ... hotostream
http://www.flickr.com/photos/kayler00/7 ... 9312507694
http://www.flickr.com/photos/kayler00/6 ... 9677149249
http://www.flickr.com/photos/kayler00/7 ... 9677149249
http://www.flickr.com/photos/kayler00/7 ... 9677149249
Gwyneth Paltrow: http://www.flickr.com/photos/kayler00/7 ... 9677122953
http://www.flickr.com/photos/kayler00/7 ... 9312467010
http://www.flickr.com/photos/kayler00/7 ... 9312460740

Henry Winkler
To emma happy new year and remember you have the greatness inside you

New favorite from John Erwin, aka He-Man: "you have the power!"

I Just started so I dont have many yet but by far my favorite that I have gotten back is signed by Channing Tatum and Jenna Dewan-Tatum. I wrote to him and added last minute if it would be possible for her to sign it as well. I sent a pic of the Step Up movie cover its one of my fav movies. Was so exicited to see both of their sigs on it and one of them had wrote "To Ashley with all our love".

mine is jonathan goldsmith aka the most interesting man in the dos equis commercials

he wrote "see you at the palace" he also wrote me a letter back thanking me.

truely my greatest return TTM

Mine would have to be....
Kathy Bates- To Jessica
Candice Cameron- To Jessica Blessings To You
Nikki Reed- To Jessica Lots of Love
Arabella Morton- To Jessica xoxoxox
Ed Asner- Jessica My Best Wishes

a few of mine would have to be
1spencer Scott model she wrote Jason thanks for the sweet note baby I hope you enjoy this muah xoxo
2. my robert Englund book Hollywood Monster he wrot Jason change your name Puck Face or else LOL
3. Natalie Tena Tonks from harry Potter she wrote Jason may have an epic life.
4. Nikki Leigh Playboys miss May 2012 she wrote Jason Thank you for all you love and support if you believe it you can achieve it xoxo VERY SWEET
5. Dave Prowse AKA darth Vader wrote Jason I am Your Father
6. Candace Cameron Bure wrote To Jason Mallory Blessings to you

Danny McBride signed baseball. He added... "Kenny Powers" and "You're FU@#ING Out!"

Bobby Hull Fight Photo. He added... "You should have seen the other guy!"

Alan Oppenheimer - "to my #1 Skeletor fan, cacklingly yours."

Julie Adams - "the Black Lagoon is no place for a date!"

Maurice LaMarche - "would you still love me...with a lizard's face??" (he does the voice of Vincent Van Ghoul on Scooby Doo: Mystery Incorporated! and I mentioned in my letter that that line had become a running joke around our house)

Robert Englund - "read or die!!" (mentioned I was a teacher)

Peter Cullen - "roll out!" (on my Optimus Prime pic)

Susan Egan - Meg in Hercules; signed one pic "it's been a real slice" and another pic "to a real wonder boy!"

Tim Rose - Admiral Ackbar in Return of the Jedi; signed both pics with "our cruisers can't repel firepower of that magnitude!"

Jerry Terheyden - actor who provided the voices of all the villains on the 1970s Fantastic Four radio series. I sent him a collage of all the FF villains, and he wrote "to my fan and friend Lucas, from your friend and fiend, Jerry Terheyden." He also sent a really nice thank you card and he wrote "thanks for remembering." Sweet man.

Ray Park - on a Headless Horseman trading card: "Lose your head?"

Just received 2 nice photos from voice actor Tom Kane. On the Powerpuff Girls pic he wrote "yay" by the Professor and "boo!" by Him, and on the Ultron pic (from Avengers) he wrote "you WILL submit!"

I'm sure there are others...those are the one that stick out in my mind right now.