All of the following exercises are basically variations on the chromatic scale concept. After you have done a few of these, you will begin to discover new patterns of your own. By no means should you limit yourself to the exercises I've offered here. These are intended just as much to stimulate your own exploration and discovery as they are to provide ideas for practice.
This is a sort of ascending chromatic scale exercise. If the sequence chart becomes confusing, just keep in mind the pattern: four notes on each string, moving up a single fret each time you change to a new string. This can be done forward and backwards, and after you complete each run, return to your low E string and start over, begining one fret higher each time until you have covered the entire fretboard, both ascending and descending.