The main tendency of a new hairstyle mode is the mixture of styles. By combining absolutely different trends (e.g. youth haircuts, bright and colorful hair plus formal business suit) you can get interesting and non-traditional appearance.
Mix styles, but be sure to stay in reasonable frames. Thus, evening dress should still be evening dress. But notwithstanding of the hairstyle you choose, keep it well-groomed and cared. Only healthy and beautiful hair is in fashion and will always be!