Watch the Day 5 online guitar lesson by Ravi from Learn Guitar in 21 Days
We're still going to stick with songs that only use two chords, but we have more options to choose from since we know three chords. So, the combination possibilities have increased. Check out my examples using some grooves.
Also, some of the songs that you previously played with A and E, you could try with D and A instead. This is just moving the song to a different key which will alter the sound, but will still capture the sound of the song.