I have a plate in mind that has nothing to do with Lotus or Elise, but I haven't ordered it yet because I don't want to pay to have the plate for 6 months or more until the car shows up. And I don't want to put it on my current car and then go through a hassle to change it over.
In California, some plates have 6 characters (e.g., the Arts plate that I want, with a palm tree and sun, very Kalifornia-like) and some have 7, giving you some flexibility (and of course, you can have fewer characters on the vanity plates, if you wish). And you can check your prospective combos on-line. I played around with Elise and Lotus themed plates and found some that were ok and available, but nothing that blew me away. Who knows, though, I seem to have several months to change my mind.