Three lego dragons I own. They all have modified paintjobs on them, subtile paintjobs like horns and teeth. Using a sharpie I made the horns and teeth silver and gold and drew some patterns on the winged dragons (the blue one looks horrible I know. I didn't sketch out the pattern before hand)

The winged dragons are from Lego Elves and the long one is from Lego Ninjago movie line (just released to store)