Never seen that and don't like the sound of it. Do full screen videos and photos show any colour anomalies?
If so I would visit an Apple store and get it exchanged. Backup first though.
Yes when you jailbreak there are a few off colored pixels that appear on the right side of the screen during power up due to the coding. It would be nice if there was a fix for it but for now you need to deal with it if you want to JB