Skinhead question

I don't have the time or inclination to research this myself, but I have a burning question about skinheads. Can anyone tell me what it signifies when they use red laces in one boot, and black laces in the other?

I saw a guy who had done up his feet this way on the train last night, and it made me really curious. So I decided to tap my wonderful base of knowledge here, and see if any answers surfaced.

If you don't know, I'll be your best friend if you look it up for me. :)