To try out these small vibrato exercises here is the backing track I used. Play the blues licks you know and stuff you are figuring out to do this in the key of Bb.If you want an outside sound play F melodic minor and the Bb minor pentatonic. Play some melodies on the turn around and have fun with the slides and stuff,do all this but please enjoy it :)
https://docs.google.com/open?id=0B5qJqMU7g1nHNGVZbDhMUlRNYWs