These are apparently my 'house brett' - the cleaner-looking is a Wyeast 3068 Dunkel that I'm going to bottle this weekend, developed this pellicle 1-2 weeks ago, unwelcome.
The other three are all of an Old Peculier clone I brewed spring 2015 using WLP500 - after a few weeks it too started developing a pellicle almost identical to the one on the Dunkel. These photos were a couple months later, same shot with three different lightings. One with ambient lighting, one with camera flash (shows that the flash is really NOT the best for many shots like these) and one is with a ridiculously bright flashlight a couple feet from the carboy, my favorite shot.
The O.P. pellicle started out looking pretty much like the top pic, the dunkel, and after a couple months it looked like a plate of marbles dusted with dark DME. Tasted delightful, one 750ml bottle left, inspired me to rebrew the recipe with the 9097-PC, in my previous post. (which will surely end up tasting wildly different but doubtless good)
Flavor from this 'infection' is not overt, at least not within a few months. Musty, very faintly fruity perhaps, but that could have just been the WLP500 still being noticeable.
Just had to chill the last bottle of the OP, will probably drink it this weekend.
j