I use my king of snake to distract people. I don't know does it work or not but at least it makes me think I do better when it is flashing somewhere behind me while I'm shooting at enemies.
get some soft core, so you won't get banned, spray it by a ladder where people are gunna see it, and wait with melee upgrade and hide in the corner. man I'm gunna try this. btw you all seen this? http://www.youtube.com/watch?gl=GB&hl=en-GB&v=29RE0blCV84
When I used to play NS I had a spray that was: turret --X-- here plz Because commanders would always place their turrets wrong and a skulk would shot up and eat the entire base.
I had a problem with uploading sprays for awhile, it said it wasn't the right dimensions or some shit so I would have to re size them. But I just found out that it lets you upload any size BMP file. So if your having trouble uploading a jpeg or whatever just make it a BMP and it will work..
How about something that looks vaguely like a soldier? Like in GE:S where this one guy sprayed something that looked like Bond. It had 5 or 6 bullet holes in it by the end of the match, lol.