I didn't know they made bumps for Rocky and Bullwinkle. I always remember seeing the generic late-night bumpers used with that show (or maybe that was Dudley Do-Right)
There were Rocky and Bullwinkle bumpers. I don't remember the "Back to the Show" one but the "We'll Be Right Back" one involved Bullwinkle onstage doing a magic trick with a Hat. Dudley Do-Right had generic ones. I really would like to see the Tiny Toons bumpers.