OK here is a fun website that will let you add text and it will code it for you to do different things. The site is tektek.org (update 12/13/2018: site no longer exists)
It will code it in HTML and in BB coding.

Guess what geekdrop will now also accept BB coding - yay stardogg

OK here is rainbow writing:
See its like I'm typing in skittles type....feel the rainbow. This is a fun site if you want to comment in color or if you want to use it to comment on social sites. I just thought I would share this site