Cliff Chiang did this gorgeous Traci Thirteen for me; someday I hope to get a Doc Thirteen to go with her.
Jeff Smith busted out this Fone Bone and Ted the bug for me after I wore the poor guy out with my stack of hardcovers to sign. He apparently hadn't seen the original individual hardcover Bone volumes in a while so it was nice to surprise him.
Hawkman by Franco and Hawkgirl by Art Baltazar. They're the team from 'Tiny Titans' that also write 'Billy Batson and the Magic of Shazam' (with art by Mike Norton); they've been to every con we've gone to for a while and we always are sure to stop by.