For Example Rainbow Block/Vehicle:
1.onActivate>Self>fireRelay (Relay 33)
2.onRelay>Self>ChangeColor (Relay 50)
3.onRelay>Self>ChangeColor (Relay 100)
4.onRelay>Self>ChangeColor (Relay 150)
5.onRelay>Self>ChangeColor (Relay 200)
6.onRelay>Self>FireRelay (Relay 250)
Then Click that Evented Brick and there you go! Rainbow Block/Vehicle!
Also, you can make it with lights and you can make Relays 50 100 150 200 250 300 for fast and 100 200 300 400 500 600 for Slow.
That's a Fun for Races or something if you want a funny Rainbow Vehicles.