This is an illustration for a book entitled "If you could do anything tomorrow- what would it be?". The illustration just had to be about something that you would like to do. The text on my image reads "Create my own religion (and make millions from gullible morons".
The symbol isn't anything to do with Quake (I didn't even realise the similarity until a few people mentioned it). It's the greek letter 'psi' which I use as my signature. I've been writing this a lot in replies so thought I'd save myself time by writing it here instead.