I don't know what TCM has done in the past, but if I could program a year's worth of star months, I'd do:
Peter Sellers -- even in his bad movies, he's always fun to watch
Jean Simmons -- because watching her makes me blush and tittle
Abbott and Costello -- have they ever had co-stars of the month? this would be a real treat
Paul Newman -- the coolest actor in movie history
Margaret Lockwood -- does she have enough for a month? Maybe a week or a day, but I'd love to see something besides just The Lady Vanishes
Peter Ustinov -- I always have fun when Ustinov's in a movie
Jack Lemmon -- ditto
Rosalind Russell -- such a firecracker!
Ray Milland -- after The Uninvited and The Lost Weekend, I'm ready for lots more Milland
Boris Karloff -- he made so many B-movies into classics it's ridiculous
Bugs Bunny -- why not? Name a bigger star! Plus, the kids love him, I hear.
Marcello Mastroianni -- THE Italian classic movie star