La Folie is a Flemish brown ale which is aged in French wooden casks for 1-3 years. Unlike a lot of Flemish ales it isn't blended with younger beer so it's extremely sour (more so than, say, Duchess de Bourgogne). Without a doubt it's one of my favorite beers.
I think if you start with a Flemish brown ale around 6-7% potential ABV (1.060 or so) and pitch the White Labs lambic blend, you will get something similar but it will take about 2 years of aging with a few French oak cubes added to the fermenter. If you can find them, the 750mL bottles are bottle conditioned, the dregs could be cultured and pitched into the secondary which would be ideal.
Here's a starting point, from Wild Brews... hopefully someone else will have some ideas for tweaking. I definitely don't get the raisiny or bready character typical of a Flanders red in this brew, so I think this would be pretty close...
70% Pils
10% Caravienne
10% Caramunich
10% Flaked maize
Hallertau hops to 25 IBUs. Boil for 2 hours.