there are many chords that you can play with pentatonics. Major, Minor, Major and Minor 7th, 7 #9 (known as the hendrix chord, he usually plays it on the last step of a 12 bar like in E, then to A, then when you get to B he would use the 7 #9), you can also use 9th chords, I usually use the in the A position (in an E 12 bar).