Here is a simple rule I am going to try next campaign. Monsters are worth 1/10th their listed XP value and a gold piece is worth 1 XP. I expect it will promote a bit more exploration and creative thinking in how to extract as much treasure as possible from a dungeon. Reminiscent of D&D Basic and 1e.
Old School XP in 5e
Actually, I prefer the Blog of Holding way of doing this:
http://blogofholding.com/?p=7222
Though I have moved on to using milestone XP these days since it allows for better pacing.