They are from a 15mm game called Demonworld. Specifically I got them from
www.brookhursthobbi es.com. The pack I have is from the Empire army. They are very high quality decals (transfer, waterslides, whatever!). For $10 each pack contain two sheets with the following: Serpents (which I used), crossed swords, white horse head, a bull head, a yellow griffion, and a really cool dragon and flame decal which I will use somewhere eventually. With exception of the dragon/flame decal you get 42 on each sheet, plus two large decals
Along with the Empire decal pack, others currently available in English speaking countries are Elves, Orcs, Dwarf (they are called something else), Dark Elves, Goblins, Isthak, and Thain.