Types of voices and accents:
Gruff, raspy, smooth, low, middle, and high ranges, young child, snotty teenager, natural sounding young man, middle-age man, stereotypical tired old man, baritone "opera" type voice, stereotypical radio announcer, masculine, feminine, rock star shriek, army general, Snooty Oxford British accent, theatrical, stereotypical high-toned Broadway Musical voice, wild, nerdy, calm, strong, shaky, redneck, gangster, "gangsta", preacher, creepy voices, "evil villain" voices, sound effects, etc.
Voices I can impersonate to some degree:
Courage the Cowardly Lion, Sylvester Stallone, Assy McGee, Elvis Presley, Alexis Marshall, Glenn Danzig, Jim Morrison, Frank Sinatra, Tom Waits, Pickles from Dethklok (Metalocalypse), Louis Armstrong, Dave Vanian, Mike Patton, Jello Biafra, Stewie and Quagmire from Family Guy.