If the room has a lot of light entrances, then you can even use dark colors. When you have a small space and there are not so many light entrances, then I suggest you to use some light colors instead.
If you count with a short budget there is no necessity to spend a lot of money to make a space look different, sometimes changing the color of the walls will be enough.
Here I present one of the renovations projects I have made. Hope you like it.
BEFORE the room looked like this
BEFORE the bedroom looked like this
and AFTER little changes
Don´t be afraid to experiment with color