Ethereum might shift to POS concept at some time in the future. At present there are no updates regarding this, and we cannot comment on our own.
If you are in a way to mine POS currencies you could try mining Dash. But on the contrary, there should be around 1000 dash currencies for you to get an annual return. Currently now each Dash is around 350$ and you need a holding of 350000$ in dash to get an annual return. Dash is not purely a POS, but it works in the way of Staking.
If you are not interested in Dash, try with Neo. Neo along with its own has a additional token known as Neogas. Each Gas is around 15$ each at this time and you could get good returns of you try to mine Neo. You can check your profits with Gas
here OKcash has been another crypto which is rewarding the highest returns to its users when compared to other POS coins. You can get around 10% of annual returns from okcash. Other similar currencies include Nav and Redd coins which follow the POS concept.