I have difficulties deciding color schemes too. Especially when I do not really know how much colors I even need. How many colors do you actually have? and what kind of colors should you choose?
Another thing! I found out that using HSL is incredibly easy to find colors which just fit together. Just find a saturation and lightness level that fits you well, and play with the hue slider then. the colors are on the “same level” then. If something is wrong on that method, please tell me :P
Here is an example of an experiment how to use HSL for background color: http://codepen.io/martin/pen/dzBbu
Another thing to mention: mind the contrast ratio. I found this lately and it is cool to see how different colors on the same saturation and lightness level can be a good or bad color for text or background ;)