Ok I'll start first with images from state seals,medallions,icons,treasures.
Lead seal of tzar Simeon the Great
Icon from early mediaval period. The icon shows similarity with other Bulgarian pre-Christian art (pictures 3,11) and with examples of early Iranian art - image of Sogdian and of Midian men (picture 2.1)
This is plate with image of man - possibly priest called kolobur in Bulgarian.
Golden dish from the treasure of Nagy- st -Miklos with image of a horseman holding his killed enemy's body.
Golden dish from the treasure of Nagy-st-Miklos with image of a horseman shooting with his bow.
Golden medallion of kanasubigi Omurtag.
Two Bulgarian medallions found near the city of Preslav.
Bulgarian medallion found near the mediaval fortress near Dobrich.
Seal of tzar Petar.
Lead seal of kanasubigi Boris/knyaz Mihail.
Famous Madara horseman. I will post a research about him but I need some time to translate it.
Seal of kanasubigi Tervel.