Okay, here's one where I really need your participation. If you have anything to contribute, post it.
I was on a shoot yesterday where a lot of stuff went wrong. Some of it was under our control (I tried to use a faulty power strip to run power to a teleprompter), and some of it was not (we could not get the HVAC system shut off). We all survived, and the footage looked great (in case you were wondering).
At one point, we lost a light due to what I though was a bad lamp. I had a spare and changed it, but it still didn't work, so we had to change lights. The problem was that it was the lowest wattage light in my kit, and I had neither scrims for the replacement, nor ND gel to knock the light down from the replacement head, and the room was too small to move the light back (it was a hairlight).
So, I threw some full CTB gel on there, knowing that it should knock down the light by a couple of stops. It helped, but it was still a bit too hot, and looked (as you would expect) a bit blue. Not a bad thing, as the woman we were shooting had dark hair, and was wearing a lavender top. But it still wasn't right. So Paddy (yes, the Paddy who says he knows nothing about 'tech stuff') said I should put on another one. I told him I couldn't, because it would look even more blue. So he says, 'well, what about a different color?" I threw a full CTO gel on there along with the CTB which knocked it down another stop and canceled out the 'blue' effect of the CTB. Good work Paddy.
So, this is a long winded story that will show you 2 things:
1) Using full CTO with a full CTB acts pretty much like an ND gel because the 2 colors cancel each other out.
2) When there is a problem on a set, make suggestions. Yeah, they may be crazy, and may not work at all. But, on some occasions they may solve a very big challenge.
What do you have? Cheap alternatives to pricey gear? Do-it-yourself projects that have paid off? Special techniques that have been really effective?