Here is a trick I used when I started learning open chords that were not played at the nut. Look at the strings you hold down in any open chord. Derermine what the notes you are freting in that chord. Now look up the neck and figure out where you can find those notes up the neck, on the same strings that you held when you played the open chord. Finger those notes on the same strings as you used when playing the chord at the nut, and leave the rest of the strings to ring out open. In this manner you can find at least 3 inversions of any open chord. It sounds much more complicated than it is.

This is a great way to change up the sound of your strumming open chords, because you can play 3 inversions of all those open chords. When you play the inversions up the neck it builds tension, when you play them going down the neck, it reduces tension. A simple way to expand your use of open chords and broaden your musical palette. I hope that made sense!