Watch the Day 19 online guitar lesson by Ravi from Learn Guitar in 21 Days
By picking individual strings rather than strumming them together, you get a very melodic pattern that lends itself to many songs, especially ballads. Because minor chords often evoke a "sad" or "mellow" sound, this technique is especially suited for minor chords, but by no means is it limited to them.
Experiment arpeggiating, or picking, all the major and minor chords that you know while changing them in the same sequences that we have done up to this point. You'll really enjoy this new color and the options it will give you for playing your favorite songs.