Fancy lettering is great. Simple lettering can be great, too. If you think about each letter as a part of a design instead of just a plain old letter.
One way to turn simple letters into a design is to switch up the sizes. Make some of the letters bigger than normal. Make others smaller. Switch up upper and lowercase, too.
The only rule here is that whatever you end up with is visually interesting. And you'll most likely want to be sure people can actually read the message, too!