1. Start by finding/making a button base you like, then add your sitename to it. Here's the button I've chosen to use:
2. Dublicate the button several times. I, for instance, have to dublicate it 8 times, since my website-name consists of 8 letters. [ADDICTED] To dublicate it you have to click on this:
3. Zoom into the first frame. Then use the Text tool, which looks like this: .
Now put in a letter in the exactly same size and font on the first letter.
Remember to select another color, when you're doing this. Continue doing this til you've gotten every single letter colored.
4. Save your button and you're done, here's my result:
. 
