I was doing some more experimenting tonight. Again I was doing the longer exposure thing and flashlight, but this time I cut a Mountain Dew bottle to try to use it as a green filter (wanted it to look like the Thermal Sights). Anyways, here are the results:
Attempt 1, the Mountain Dew thing just over the lens. The green didn't come through. So I thought a bit and tried...
....Attempt 2, bottom of Mountain Dew bottle over flashlight. Gave me the greenish light I was looking for.
Attempt 3, normal light, Mountain Dew bottle over lens.
Attempt 4, Mountain Dew bottle over lens along with the bottom of the bottle. Gives it an abstract look.