In the both the viewfinder AND photos??? The only thing that's really in common with those two scenarios would be the lens. Try a different lens, if you can. Otherwise, you need to contact Canon Support, 1-800-OK-CANON.
I guess bad row/column circuitry from the sensor to the rest of the electronics. Call Canon to see how much it will cost to fix.
The low color saturation, assuming it isn't intentional, suggests an even broader circuitry problem. Did the camera get wet or something?
Did you ever get the problem fixed? my T3 just started the same thing
If you see the issue in photos, then your camera needs to be repaired. If it is only in the LCD screen, your camera may still need a costly repair. But, if it is not affecting photos, you may or may not want to spend the money to fix it.
I suggest that you take note on where the problems appears; viewfinder, LCD, and/or photos, and call 1-800-OK-CANON.