well he's what I do and it almost always sounds good. Besides the whole 1,5 and 1,5,8.
I like to use there. If you play anything on the E string high or low and also play one fret higher on the G string you get a 1 and major 3rd, which will give you and major chord. That's nice. one song I play uses those. Then if you again playing anything on the E string and play the same fret on the G you get a 1 and a minor 3rd, which will give you a minor chord.
Some may wanna call this is double stop but it still get the job done.