Yesterday I played with a new band at the drummer's family reunion. I was running late (2.5 hours of sleep

) but a friend of the drummer was there, and he happens to be a very talented bassist so he filled for a bit.
Last time we played out, I let him play my bass and through my amp. He was very appreciative so he brought along his Marcus Miller Fender Jazz and let me play it yesterday. Very nice instrument, but while I was playing it I had a bit of an epiphany.
The main feature of this bass that jumped out at me was the fact it had the neck p-up cover still installed. I usually anchor on the neck p-up or E string and play over the p-up, but I couldn't on this one. It was very difficult and uncomfortable for me to play "normally" except over the bridge p-up, but there were a few songs that called for the tone you get playing near the neck.
So, after fiddling around a bit and trying different things, I ended up playing with one finger, a la Jamerson, and using the p-up cover as an anchor. While playing I found myself more consciously aware of the groove, note selection and note placement since I couldn't easily do fast runs, or toss in quick dead notes. It was like a light switched on and things made more sense when it came to the groove. I impressed the hell out of myself with some of the things I was doing and got loads of compliments from the people there including the owner of the bass.
So anyway, I guess my suggestion would be simple: handicap yourself in some way while practicing, it'll make you rethink your approach to how you manipulate a songs groove and you may figure out some new tricks.