The trick is...
... they are not craters but gas-escape structures and phreatic volcanoes from the lava flows. In some of the wider-angle pictures you can see a few small real craters, and suddenly it will all snap into shape.
Try rotating the image (or your monitor, or your head) or making it negative. (Using an image-processing program). Tricks like this help the forebrain convince the hindbrain what it should be seeing...