Well, I was going to help you but audioguru seems to have sorted you out and I don't think I have anything useful to add other than an amusing story (if you have my sense of humour) about a recent application for this circuit.
I modified the side lights on my Land Rover some time ago with green LEDs to match the colour of the vehicle. Took her in for an MOT (that's a compulsory annual test of roadworthyness here in the UK) and she failed for the lights. They're not allowed to be green, they have to be white.
So I took her home, and pondered the situation. I quite like the green glow when the side lights are on and I didn't really want to have to put her back to the original spec. I could Take the green LEDs out, fit white for the MOT and then fit green back in there afterwards but that would be a bit of a drag so in the end I re-modified the light cluster with green AND white LEDs. I hooked them up to a circuit similar to the one AudioGuru has shown here, with a button installed into my dash marked "MOT button". The circuit is powered by constant 12V so it always remembers it's current state.
I took the Land Rover back in for the retest and the mechanic called me over. "These lights are still green!!!" he said. "Push the MOT button on the dash!" I replied, and left him to it. Needless to say she passed, and I drove out with green lights
Childish I know. But hey gotta be done every now and then!
Might think of some more things I can hook up to the MOT button actually. Hmmmm...
Brian