To paint on a budget, I went to Home Depot and bought kilz paint and had it tinted to the colors I wanted. Kilz is cheap and covers really well.
Step 1: Prepare Your Walls
Look close at the picture and you will see my lines. My walls are yellow when I started.
I used three shades of green with a brown. But you can use two greens and a brown or two browns and a green. How ever you want to do it.
Step 2: Start Painting
I used paint brushes for each color and hand brushed around the corners. Then filled in with the brush.