“Cerridwen’s themes are fertility, creativity, harvest, inspiration, knowledge and luck. Her symbols are the cauldron, pigs and grain. The Welsh mother Goddess, Cerridwin also embodies all lunar attributes and the energy of the harvest, specifically grains. In Celtic mythology, Cerriwin owned a cauldron of inexhaustible elixir that endowed creativity and knowledge. At the halfway point of the year, Her inspiration comes along as motivation to ‘keep on keepin’ on.’ Her symbol is a pig, an animal that often represents good fortune and riches, including spiritual enrichment.
Since most folks don’t have a cauldron sitting around, get creative! Use a special cup, bowl or vase set in a special spot to represent Cerridwin’s creativity being welcome in your home. Fill the receptacle with any grain-based product (like breakfast cereal) as an offering. Whisper your desire to the grain each time you see it or walk by. At the end of the day, pour the entire bowl outside for the animals. They will bear your wishes back to the Goddess.
For meat eaters, today is definitely a time to consider having bacon for breakfast, a ham sandwich for lunch or pork roast for dinner to internalize Cerridwin’s positive aspects. Vegetarians? Fill up your piggy bank with odd change you find around your house and apply the funds to something productive to inspire Cerridwin’s blessing.”
(Patricia Telesco, “365 Goddess: a daily guide to the magic and inspiration of the goddess”.)
Thalia Took tells us that “Cerridwen [pronounced (KARE-id-ooín or KARE-id-win)](‘White Sow’, or ‘White Crafty One’) is the Welsh grain and sow-Goddess, keeper of the cauldron of inspiration and Goddess of transformation. Her son Afagddu was so horribly ugly She set to making a brew of wisdom for him, to give him a quality that could perhaps overcome his ugliness. Every day for a year and a day She added herbs at the precise astrological times, but on the day it was ready the three magical drops fell instead on the servant boy, Gwion Bach, who was set to watch the fire. Instantly becoming a great magician, the boy fled from Her wrath, and as She pursued him they each changed shape–a hound following a rabbit, an otter chasing a salmon, a hawk flying after a sparrow–until finally the boy changed to a kernel of wheat, settling into a pile of grain on a threshing-floor. Cerridwen, becoming a black hen, found him out and swallowed him down.
Nine months later She gave birth to Taliesin, who would be the greatest of all bards.
Called ‘the White Lady of Inspiration and Death’, Cerridwen’s ritual pursuit of Gwion Bach symbolizes the changing seasons. Her cauldron contains awen, meaning the divine spirit, or poetic or prophetic inspiration. Her link as the Mother of Poetry is seen in Her reborn son Taliesin, and in the Welsh word that makes up part of Her name, cerdd, which also means poetry.
Cerridwen signifies inspiration from an unexpected corner. Plans may go awry; projects may change. Do not be too quick to hold a project to its course–instead let it take its shape as it will.
Variant spellings: Ceridwen, Caridwen, Kyrridwen” 
Sphere of Influence: Magic and fertility
Preferred Colors: Green
Associated Symbol: Cauldron
Associated Animal: Crow
Best Day to Work with: Monday
Best Moon Phase: New
Strongest Around: Imbolc
Suitable Offerings: Vervain, acorns
Associated Planet: Moon 
This 13 minute video does a wonderful job discussing Her story and Her aspects.
Took, Thalia. A-Muse-ing Grace Gallery, “Cerridwen, Welsh Goddess of Inspiration“.
Covenofthegoddess.com, “Goddess Cerridwyn“.
Daily Goddess, “Cerridwen: Death & Rebirth“.
LadyRavenMoonshadow. Within the Sacred Mists, “Goddess of the Week: Cerridwen“.
Monaghan, Patricia. The New Book of Goddesses and Heroines, “Cerridwen“.
MoonBird, Maeve. Order of the White Moon, “Ceridwen“.
Revel, Anita. igoddess.com, “Cerridwen: mighty and magical can-do woman!“.
The Sisterhood of Avalon, “The Goddesses“.
Took, Thalia. A-Muse-ing Grace Gallery, “The Tale of Cerridwen, Welsh Goddess of Inspiration“.