The Icons

My shrine? Oh, you're going to laugh... I have the Lady of Amber Strings and the Moonlit Rake facing each other, along with- Hey, don't be laughing already! Get back here!

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Subject to worship by both Humans and the demihuman tribes, the Icons are representative deities that are used to personify and explain facets of the world.
Their names are general, more akin to titles than given names, and many individuals pick and choose what Icons they feel are most important in their lives and their professions.
The Great Wyrms have always been somewhat unreliable when asked about the Icons, as the origin of the faith has been lost to time, with few ever having given a direct answer. Not that many ask them religious questions when the Wyrms deign to speak.
It's generally accepted by aetherologists that the 'real status" of the Icons is somewhat irrelevant, as the belief in their existence would have caused their creation at some point in Human history, given the sheer force of will that whole populations can provide. The extent of their power is really where the question lies, and what version of each summoned Icon is maintained by the public's collective conscience.

While the carved figures of the Icons are largely the most common form of representaion, there are many others that take slightly different forms. One I find the most intruiging is the "god-decks" of the Frühlings. Instead of a shrine, an individual collects painted cards that represent what they wish for that are then added to a personalized deck.  
This deck is often used in a oracle-like fashion that involves drawing a particular number and layout of cards to acquire predictions of ones personal future.

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While worship takes a great many forms across the known world, the practice of maintaining a personal shrine is quite common. The shape of the shrine varies, but the most integral part is the use and placement of the Icons.
If one is sufficiently well-versed in local culture, viewing the personal shrine of an individual can tell you a great deal about them, psychologically speaking. To place the Lady of Amber Strings facing and paired with the Lord of Obsidian Keeps is praying for romantic love and stability in life. To replace the Lord of Obsidian Keeps with the Moonlit Rake in this pairing comunicates a desire for a more...carnal type of relation.
Of course, other wishes can be communicated in this fashion, past and above the more base emotions. There are Icons of protection, of harvest, and of craftsmanship. Ones that speak to love, and vengeance, and other more abstract emotions and ideas. If there is something that Humans can conceptualize, someone has placed it upon their shrine.
This includes negative thoughts and concepts, though they are likely placed there in an attempt to ward off what they represent through offerings, in the inverse of what one would place more positiely connotated Icons for.
On the topic of offerings they, like the Icons themselves and their meaning, are somewhat open to personal interpretation. Many take it as a sign to sacrifice something, most often a personal possession or something that had been earned through effort. It is not uncommon for the center of a shrine to have a bowl set within where a flame could be lit, and the offerings burned. Others think the sacrifice is to be a more personal affair, involving Aether crystals which are then condensed by the paritioner. The Aether within the crystal, when taken in during prayer, is said carry the blessing of the related Icons.
There are, of course, other options for all these facets of worship, but to list them all would have both writer and reader sitting till the end of days.

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The form that priests take within a society that takes no standardized form of worship and clergy, they can vary a great deal in appearance and operation. Even if the term of 'priest' can be uniformly applied is up for debate.
The Congregation of the Silver Garden, who speak the good word about the Gardner of Silver Thorns, are known for their silver gloves which they wear as their symbol of ordainment.
On the other hand, the 'priests' of the Moonlit Rake really have no central authority of worship, nor holy vestements of any kind, nor do they really have an official recognition. They're pretty much all just individuals who chose to espouse the ideology that the Moonlit Rake represents.