BLUE button

Blue inserts a '-' in between each letter in the domain name. The '-' is the only non alphanumeric character allowed in a domain name.

GREEN button

Green replaces all the vowels in the domain name with a number:

Letter Number
 A 4
 E 3
 I 1
 O 0
 U 6

RED button

Start with the odd numbered letters first then the even numbered letters.

YELLOW button

Start with the first letter then repeatedly swap the next 2 letters around.