Pandora recently launched a new station called Thumbprint Radio. As the name suggests, this station is based on the music you've given a thumbs up to -- whether it was 10 minutes or 10 years ago. You'll hear your favourite songs connected in one station, as well as new ones Pandora's algorithm believes you'll enjoy. So it's both a super-personalised station and good old Pandora music discovery in one playlist.
You won't see the Thumbprint Radio station until you have at least three stations with four thumbs on each. Go to Pandora to see if it's available for you now or just keep thumbing up.