M1911/HK P7
Use them a lot. That way they actually HAVE been there. As you come across little things that bother you fix it. Like, I had an airsoft shotgun that I didn't like the way the sling swivel caught on brush, so, I removed it. NO ONE likes a poser, and any good airsofter could tell in the first two second of a match that you aren't as good as you looked, and that you HAVEN'T been there. They could tell because you would be out in two seconds.

randkl
My niece has Hello Kitty stickers on her pump shotgun. Use a few of those and I guarantee your opponents will be hesitant to get near you.

Olger H
heart and butterfly stickers