Hermarkhos, Philodemos, and Lucretius tease us with their speculations about the characteristics of the gods, and therein set a precedent among Epicureans to wonder about their form...
I think Demetrios of Lakon wrote a book entitled On the Form of the Gods (is that right?)
Even so, I wonder if the best way to think of the gods is primarily as a pure mental impression, (regardless of the corresponding atomoi that left said impressions.) Excuse some of the idealistic implications of the follow image by Alex Grey, but I feel like this brings together a few elements that I think are key to Epicurean gods: mental experiences, usually in dream-states (...drug-induced?), of divine quasi-humans, and the assigning of names to the category of the divine quasi-humans.
Just some more food for thought. Here's (above) an image that depicts (to me) the gods primarily as mental concepts, rather than as physical object to which mental concepts corresponds.