I love the flash, showy, theatrical design to the character, and what I can infer from Leto's gestural, wriggly performance.  No tattoos?  Dare we believe?
This is strikingly similar to a concept I wrote about here some time between Batman Begins and TDK, where I suggested that The Joker's flamboyance could be modernised by having him drive a stolen purple sports car and wear an 80s style suit with an open shirt.  I think I suggested he would wear polarised shades.  Clearly that detail was omitted to avoid cries of plagiarism. 
