When your brand colors are undefined or in a riot, you already send out a message that your business is not professional. Try and choose the colors that define the personality of your brand. That way you become consistent and your clients can easily associate your brand with specific colors. Try not to use colors that clash. There are color combinations that can go well with each other. For instance black will always go well with deep blue and Red can do well with white. Use contrasting colors, so that they are not totally off. Keep it down to two or three colors and make sure that all communication you put out falls within these colors.
