Hookha,
I started out playing the blues, loved it and lived it. Walking basslines, Albert King's Born under a Bad Sign, Laundromat Blues... Even "Stand By Me" played long and slow had that soulful feel to it. Then I discovered....
FUNK.
Picked up the book '70s Funk and Disco Bass (101 Groovin Bass Patterns), and realized that it drew me in. It's *DIFFERENT*, it's up front and IN YOUR FACE. The notes aren't hard, but the timing is. If FUNK was a book it would be called "The Sound of Silence" as the rests, and playing ahead/behind the beat are just as important.
Put the accompanied CD in and listen to a few grooves, some are easy, some are very hard. You'll end up playing all sorts of techniques including muted notes. (Try playing 1/8th open string and 1/8th muted or a 1/16th muted followed by a wicked riff. It'll seem hard at first and that it doesn't sound right, but then it clicks, and hits you like a freight train and 10 simple notes never sounded so good.
Just wish I could find a band which played funk.