I've read somewhere that yellow is recommended for the entryway, in order to attract the positive energy inside.
Colors used in my room:
I used a bunch of yellows (from light - to sunny - to orange) complemented by light green and turquoise.
Tips for using color successfully:
I love color and I'm never afraid of it. I usually have a dominant color (used for 60% of the composition) and two or three accent colors, used in small doses. Eventually, any color combo works, if you love it :)