People have been using tattoo for stylish look for a long time but there was not such innovations in methods except in designs and equipments used by tattoo masters.
But now tattoo addicts would be able to implant flexible LED lights inside their skin. Developed by John Rogers from the University of Illinois at Urbana-Champaign, Coated in thin silicon rubber and waterproof, they can twist and stretch by as much as 75%. Its said they are safer for skin but so far no experienced opinion found. So you should wait before trying.