the official verdict is that you can't change the screen saver on the 6610. It is minging but your stuck with it. The 7210 can do pictures though. And i thought they were identical apart from the cases.
If they put colours on the clock it would defeat the purpose of a screen saver. That clock is a very efficient battery saver also, and if the put colors, then it's for sure that the battery would drain out every evening.
No, it isn't possible on either the 6610, 7210, 7250 or i. If you really want to change the screensaver then I guess you'll need to flash the 3100 firmware on your phone, but then you'll not have FM radio, infrared, and GPRS modem features.
That's exactly the reason why the 3100 does not have infra-red and GPRS modem capabilities, and even FM radio. Nokia wanted to cover up their doings but pretending to show us that it's got a lot of battery life. A 6610 running FM from full charge woould go around 20 hours(headset), while the 3100 may not have reached even 75% of that. By the way, can anyone confirm that in the 3100 the screensaver remains indefinitely, or after a certain period of time it reverts back to the clock?