I think I spent more than 15 hours coding and debugging this generator. I also had to ask 2 of my friends to help me with it. It looks like what I finally made - Carty - is worth those lonely hours. By now I couldn't find any better text art generator anywhere on the web.
Other generatorsAs for other cool generators on the internet - there are some pretty-looking ones, but what they generate can't be put on Facebook and other websites. They all use blank spaces to separate the symbols, and those spaces are always just ignored. View 3D text art signs on Text Art to see what I mean. The only case when they aren't ignored is when you set up the <pre> tag like I did on my text art page.
CharactersYou can type characters a-z, A-Z, 0-9, and :,.!?)(" '-+=. I think they're all you might need. Symbols, my carty uses are: ━┏┛┗┓┃┫╋┣︱┻┳ and ═╔╝╚╗║╣╬╠─╩╦ .
How it'll look on Facebook
┏┓╋╋╋╋╋╋┏┓╋┏┓How to put Carty and Tarty text on Facebook