Shouldn't a sig pic have something to do with the person who's sig pic it is?

For instance, the name WetWired involves computers and digital information, so my sig has a corresponding look:

I have a friend, King's Specter, who I made a sig for. The name King's Specter implies that he's the ghost of a character, President King, from a game that we play, so his sig has a pic of President King, and the pic and the name look kinda ghostly:

(yes, I realize that the ship fell prey to JPG compression, and I'm planning to fix that tonight)

I don't get these sigs that look pretty, but are meaningless
--WetWired