Old Nokia phones (3410 and older) have a feature to show parts of an incoming sms flash on and off.
Some years ago I made a midlet for the good old 3410 which does this trick. Basically all it does is to insert a unicode 0x0001 character around the text which should be displayed blinking. To force unicode sending of the sms a special character (0x2029) is added to the message. (Which is displayed as a weird character ....).
Thanks to the portability of J2ME it runs perfectly on the 6600 ;-)
Just download this
JAR file and send it to your phone for installation.