Voadam
Legend
Some decent flavor of practices and beliefs in the default Dawn War POL world. The feather thing is probably the closest to a manifested effect, if the rite works. While prayers might matter to the gods and to the one who prays, I am not sure this suggests the gods manifesting effects in response to prayers.Divine Power says a bit about "folk" religious practices on pp 39 and 143. I think that the default orientation of 4e is that the gods are active in the world, and that prayers to them matter.
Divine Power page 39:
SMALL DEVOTIONS
Many practices common among the people of the world have their origin in various minor devotions to the gods.
For example, someone telling a lie might splay wide the fingers of the left hand under a table or behind his or her back. Whether that person knows it or not, the gesture is meant to represent the holy symbol of Lolth, god of lies, and to ask her help in making sure the untruth is not discovered.
Another such gesture is to place the weapon of a fallen warrior in the corpse’s hand. This act is believed to arm the warrior for the next world and to show Bane, the god of war, that he or she died fighting and therefore deserves honor.
Travelers setting out on journeys often scoop up a handful of dirt or dust from the road and let it fall from their hands. Most people regard this tradition as simply checking the strength and direction of the wind, but it is meant to honor Avandra. The god is said to show a sign of the fortune awaiting the journey by blowing the dust away (which favors departure) or back toward the traveler (indicating difficulty ahead).
Page 143:
RITES FOR THE DEITIES
The people of the world and planes worship the deities in different ways. Some common practices are almost universal from culture to culture.
✦ When you are proven wrong, write down two copies of the truth you discover, keeping one and taking the other to a shrine to Ioun.
✦ After you take fruit, herbs, or wood from a forest, trace a star in the soil so Corellon’s magic can replace what you’ve taken.
✦ Swear by Bahamut when you make an oath to bring someone to justice.
✦ When you agree to an alliance or a business arrangement, interlock your fingers like the teeth of two gears—forming the symbol of Erathis.
✦ Etch Avandra’s symbol on a path to indicate a safe course or on a building to show it is a safe house.
✦ Shout at the heavens during a storm to prove your bravery to Kord.
✦ Wear golden jewelry during the day and silver at night, to please both Pelor and Sehanine.
✦ Inter a raven’s feather with a corpse to keep undeath from claiming the body.