I work for a place that we see a lot of the models "at work" but not the logic behind them.
There are guys that go around and essentially get firms up and running with their prop forex algo models and then they take 5-10% of the profit.
Then there are add ons like trading cash vs futures so it's a bunch of basis trades.
I couldn't tell you HOW or WHAT is behind it all though, they are closely guarded for the most part and cost serious $$$$ up front if you want to play.
I know excel a bit of VB and a tad bit of sql. But not C++, Csharp or any of the other stuff that is needed for a proper model....sorry man. Otherwise I would be more than happy to help.

^^^^I likes me babies stewed^^^^