Front row, from left to right: Dori (the "fruity" one, Thorin - leader of the expedition, Oin (the hearing-impaired one) and Fili.
Second row, left to right: A barrel too small to go down a river with, but still, a barell to tie in to that whole business. On top of the barrel sits a black-bird (I think it is) because I connect birds with dwarves after reading The Hobbit. Indeed, it was another type of bird in the book, but a bird as small as that one would not have been practical on this tray.
To the right of the barrel we find Dwalin, the tall dwarf; and by him stands Bofur and Nori.
Third row, left to right: Bifur and Balin, Gloin and Fili. Wedged between them lies a severed warg head.
Back row, left to right: A mushroom ring and the beginning of a dead and squashed spider. Ties in with Mirkwood. Just as the arrows on the barrel does, which I forgot to mention above.
Besides the mushroom ring we find the youngling Ori with his slingshot and Bombur, the eating-disorderly dwarf.