A lot of people feel like urban fantasy is a shortcut that gets you around world-building, because it's set "in the real world." But it doesn't really work that way, as I found out. You have to come up with just as consistent an internal cosmology and magic system as you would if you were writing high fantasy.
Cassandra ClareDear Alec and Magnus, I known we're not really close, but Isabelle just came by to drop off a pleated orange velvet tux that she claims I will be wearing to your wedding. Is this true, and if so, why orange? -Simon
Cassandra ClareIt's my motto," said Isabelle, with a sultry smile. 'Nothing less than seven inches.' Meliorn gazed at her stonily. 'I'm talking about my heels,' she said. " It's a pun. You know? A play on-" "Come," the faerie knight said. "The Queen will be growing impatient." He headed down the corridor without giving Isabelle a second glance. "I forgot," Isabelle muttered as the rest of them caught up to her. " Faeries have no sense of humor." "Oh, I wouldn't say that," said Jace. "There's a pixie night club called Hot Wings. Not," he added," that I have ever been there.
Cassandra Clare