Check out this awesome app to translate normal text into Wingdings!
▶ Easy-to-use interface!
▶ Live translation
▶ Two-way translation
▶ Share text through Twitter, Facebook, iMessage, and email.
▶ Secret rooms
P.S: If certain letters don't show up, your keyboard and unicode system does not support all the letters of Wingdings. Don't worry though, your messages will still translate perfectly.
Credit to Shlaboza for the icon.