Creepy Light Show:
In line 400 type AF 20 CD DF 20 CD BA 20 FA 36 D7 CB 77 C4 9E 03
The sprites and backround change colors. It's kind of cool.
The bad side to that code is that your game becomes VERY SLOW.
In line 400 type AF 20 CD AF 2C CD BA 20 FA 36 D7 CB 77 C4 9E 03
This will make your character go (almost) bike speed but if you go to a different city/route, your game will freeze.
Those hacks are for Blue Version. I don't know if they will work on Red Version.
Edit: The Mr. Speedy hack cannot be used with the Creepy Light Show hack, or it will cause an unknown opcode error.