How to handle unsightly cinderblock walls

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Hello BP! 

This is my first post in the DIY section. Just a quick backstory:

I have been living with my wife (Adries) at my in-laws as we finish saving for our first investment/principle property. While living here we are taking advantage of the free rent and slowly fixing up the home. So far we have re-painted/new hardware in two bedrooms, as well as renovated the bathroom with new tile, vanity, hardware, toilet, lighting, etc. They are gracious and keep splitting or paying for the repairs. So now we are onto the backyard:

There are cinderblock walls, a pool, and a patio cover that needs some love. What are your thoughts on fixing up a cinderblock wall? Given that replacing is not an option what is a good chioce? Can they be painted? Is their a simple way to modernize them? Cover them?

The backyard is mostly concrete because of the pool running parallel to the street. The back-most wall is approximately 5 feet tall with a wooden addition framed out adding an additional two feet to it. The left wall is shorter, approximately 4 feet also cinderblock, no additions. 

Current plans include: new patio, solar panels eventually, moving the pool filter/pump from the corner of the yard to the side of the house near the air conditioner to free up space. 

Thanks!

-Gregory