http://www.heraldryclipart.com/Сайт оправдывает своё название: клип-арт в виде гербов, к примеру, на
этой странице присутствует. Их явно маловато, но можно выцепить взглядом гербы с нужным символом и поискать информацию по ним в иных источниках.
Помимо этого, на сайте имеется подборка родовых девизов (mottoes) и описания символики. К примеру, по драконам у них следующее:
DRAGON: Its head is that of a serpent, with a forked tongue and ears. The body is that of a lion, but it is represented scaled, and the large wings are webbed and pointed, and resemble those of a bat. The legs are also scaled, and the feet are represented with webbed talons. The dragon is the most valiant of all living creatures because of his sharpness of sight and therefore it symbolizes the defender of treasure and worldliness. The Anglo-Saxon word "dragon" is derived from the Greek, "to see clearly", hinting at the Dragon's gift of prophecy. Although Dragons were often born out of destruction and chaos, the dragon to some cultures was an emblem of good fortune & perfection. Found in many cultures it became a symbol for volatility, the search for secret knowledge, finding your way through all things, Alchemy, the elements, eternal change, discovery of hidden treasures and the protector of all you possess.
WYVERN: The word Wyvern is an alteration of Middle English "wyvere" for viper, it is also from Old North French wivre, and a modification of Latin vipera. A mythical beast usually represented as a 2-legged winged creature similar to a dragon (much like a cockatrice but with the head of a dragon) and with wings and a barbed serpent tail. Considered a sign of strength to those who bore the symbol the Wyvern is an ancient token associated with Mercia and the old kings of Wessex. Mercia was one of the kingdoms of Anglo-Saxon England, consisting generally of the region of the Midlands. It was settled by Angles c.500, probably first along the Trent valley. Its history emerges from obscurity with the reign of Penda, who extended his power over Wessex (645) and East Anglia (650) to gain over-lordship of England, South of the Humber River. Later, the Wyvern symbol was adopted by other societies including the Slavs and the people in the South-West Baltic. The Wyvern is symbolic of valour, strength, protection, warden-ship and dominion.
HYDRA: A venomous monster of the Lernean marshes, in Argolis. It had seven heads (some say nine), and Hercules was sent to kill it. As soon as he struck off one of its heads, two shot up in its place. The stench from the Hydra's breath was enough to kill man or beast. Borne by those said to have fought the greatest of battles.