In the spring it's tough to beat a jig and minnow. A floating jig/minnow on a Lindy rig is a great spring presentation as well. As the water starts to warm around here, we'll go with leeches.
If they are relating to the snaggy rock areas you mentioned, livebait on a slip bobber is definitely worth a shot. You can put that bait right in their faces, and make 'em eat. I catch the vast majority of my walleyes every spring on slip bobbers. If you are fishing at night, I highly recommend the Thill Nite Brite bobbers. Well worth the $.
As the water warms even more, I love to cast Husky Jerks, Rouges, and Ripsticks, Lil Rippers, Reefrunners, and Ripshads. As Garnet said, a steady retrieve usually works best for walleyes ( rather than the jerk jerk we are all used to for bass).
If you are covering a larger area, mibronzeback is right on: drift. Jigs or Lindy rigs with spinners or floating jigs for more shallow water, bottom bouncers for deeper water and/or larger/heavier lures like crawler harnesses.
Hope this helps.