Some of them you can download from Flying Legends. I have a whole set of cowboy ones, including John Wayne, Lee Van Cleef, and Henry Fonda in addition to Clint Eastwood there.
A lot of these weird ones I downloaded from IL2 Skins ages ago. I really miss that site. They had
everything. I've got James Bond (Sean Connery and Pierce Brosnan versions), Pussey Galore, Admiral Kirk, Seven of Nine from Star Trek: Voyager, Batman, Spider Man, The Lone Ranger and Tonto, Men In Black, Agent Smith and Trinity from The Matrix, The Beatles, and the list goes on. Some of them look really cool.
For some excellent realistic pilot skin packs, go to Flying Legends or here:
Lowengrin.com: Downloads / IL2 Pilot Photos/Skins
EDIT: You could even decide the outcome of the Great Patriotic War in a single sortie.