If you are asking if there is a default bootstrap for this the answer is no.
But yes this is possible with your own css.
I don't see why not you could not skew the image with something like the following:
img.tilted{
-webkit-transform: rotate(45deg);
-moz-transform: rotate(45deg);
-o-transform: rotate(45deg);
-ms-transform: rotate(45deg);
}
If you want this "mask like behaviour" i don't see why you couldn't put all the images on a layer bellow and put a transparent image on the top
Or you can try to css clip it like this http://www.html5rocks.com/en/tutorials/masking/adobe/