I out together my Asag army many years ago, and decided that it required a little more effort than just gluing a few rocks to bases. In the end that's really all I did, but I like to think I did it with a bit of style.
Here's the whole army - Asag in the centre is an Aerial Hero general. To the right of the picture are eight Hordes, and to the left are three Beasts and a Behemoth. The Hordes, Beasts and Behemoth represent small, medium and large animated rocks and boulders.
The medium and large rocks and boulders were easy to put together. The Beasts I did with three different colours of gravel. I selected pieces which I could lean forward on the base slightly, as this gave a sense of movement and also made it easier to identify the element's front. I adopted the same approach for the Behemoth, but I actually bought and paid for that element; it's made up of two mineral samples from the gift-shop in the Natural History Museum in London.
I carefully selected two pieces that, firstly, would fit on the element base (I took a blank one into the shop in order to check) and secondly were shaped to give a sense of movement.
And this is the bulk of the army - Hordes made up of gravel. Now it would have been easy to have just glued these small stones to a base and leave them at that.
However, I chose to glue them to each other as well, making little (and not so little) rock-humanoids. I felt this gave the bases more animation and, from a practical point of view, made the front of the element easier to identify.
And, finally, Asag.
Asag started life as a resin griffon from a gift-shop here in Australia. However I replaced its head with that from a Games Workshop Temple Dog, to create the hideous monster you see below. I wouldn't say he looks particularly Sumerian, but he does look fairly demonic, and makes an excellent centrepiece for the army.
One day - a phrase I say a lot, so don't get too excited - I will put together an army covering his arch-enemy Ninurta, and have an epic Sumerian mythological battle. You'll probably be waiting a while for that though.