There are a few varieties of figs are actually Chimera. Such as Jolly Tiger, Panache, and a few others striped varieties. This is also happens in other fruit trees. Here's one apple Chimera...

Here's a very similar phenomenon with a red fig variety. 

Now bass do those plants produce these all the time or is it a chance ocurnece? The col de dame negra-blanca is a chimera too? 

Good question, I would think that a cutting taken from that specific branch might produce these figs... but it may revert back. 

Thanks bass I am very interested in this. I have adriano but seems to be a pingo de Mel sport that has red veins nothing too thrilling like these. Well any mutation sport or oddity.