This is the final installment of this tutorial, and this one is going to be a very simple way of enhancing your chord progressions, which is changing the quality of any chord, whenever you like. Experiment with making a Major chord minor or dominant or whatever works for you.
The main thing you have to keep in mind is that the bass notes of the chords stay the same, but the quality of the chord just changes. This technique is really what blues playing is all about, wherein each chord is a dominant but the bass notes suggest an overall key.
Here is an example of a progression with diatonic bass notes but different chord qualities.