Joy.ly allows you to utilize their interface to send tweets with more unicode characters. The person reading the tweet will get a link and come back to joy.ly to see it all, so that was a bummer. A lot of it also rides on the fact that whatever client or machine the are using may not have all the fonts needed to enjoy the experience. Windows is a prime example. Mac will work great.
The choices are like the Lucky Charms of tweets. Arrows, actions, symbols and stars.