The zip file below contains a slew of three-note voicings progressing up the neck.
Three note voicings also often allow you to have a free finger to decorate or voice-lead the chord with an added line.
By learning the progressions in these pdfs, you will not only have a cool chord run in your pocket, but you will increase your vocabulary of shapes for comping or chord-melody. While you probably have begun building up your 3-note shapes just by subtracting a note from 4-voice chords, there are other shapes which can be found that don't build up to a four-note voicing.
The voicings on the middle strings (4-3-2) are the most useful, so you may want to start there with each pdf.
Below is an example of Dominant 9 three-note voicings. The zip download contains several other types, including min-Maj, quartal and cluster triads.