As JTQatar mentioned,
Clothes and accessories should be your first line of 'attack' when it comes to differentiating yourself from the crowd.
Now, this doesn't necessarily means over-the-top bright, attention grabbing pieces (and in most cases they make men look like clowns).
Firstly, it's about wearing clothes better (fit, cuts, color and fabric coordination), so you can even take a simple shirt+khakis outfit and make it look hot. F.e. http://www.pinterest.com/pin/481111172664941937/
Secondly, introduce less common and more flattering pieces like vests, good looking/cool shoes, belts, scarfs, ties, etc. F.e. http://www.pinterest.com/pin/481111172664896566/
Lastly, manage focus - you don't want too many peacock pieces (it should be subtle) and instead build outfits so that other pieces emphasize and draw attention wherever you want it to go.
It's hard to go more specifically without actual examples of your casual/night out looks and other preferences. Still, hope this helps.