You can make your room beautiful by changing its finishing material. If you have got a cemented wall, I will recommend you to go for wood finishing.
But wood finishing seems expensive to you? I have got a simple solution for you. You can use old pallets for this purpose which you can get from shipping companies on very cheap rates because they have large store of old pallet which is no more than a garbage for them.
Cut the pallet into pieces and insert them on the wall. Keep it natural without the use of oil and waterproof paints because they will hide the original texture of the panels. If the wood becomes old, you can rework it. You van paste pictures on it or can write some quotes. A light hanging on a wall will enhance the beauty.