Amirthakadeswarar

Kallapillayar During the churning of the milk ocean to extract the Nectar, the Devas stole a bit without the knowledge of anybody and without praying to Lord Ganapathy and hid it in a secret place. To teach a lesson to Devas for ignoring him in their haste, Lord Vinayaka simply changed the place of the Nectar pot. When they searched for it, they could not get it back. Lord Shiva advised the Devas to apologise to Lord Vinayaka to get back the nectar pot. After getting the pot, the Devas went for a bath. When they returned, they could not get the pot. It has become a Shivalinga. And that Shiva Ling is Amirthakadeswarar, the presiding deity of Thirukadayur.

Jasmine
Jathi Malli When Markandeya was performing Abisheka to Lord Amirthakadeswarar with Ganga Water, Ippinjilam flowers too came with the water. Ippinjilam is a flower also called Jathi Malli (Jasmine that blossoms throughout the yea).) This flower is used only for the God and should not be used for human purposes. An archana with a single flower is considered equal to 1008 archanas.

https://www.google.com/search?q=Amirthakadeswarar

Foam Deity of Ganesh

Legend has it that the Devas, forgot to worship Lord Ganesha before starting to churn the "Paarkadal". Hence, they were only able to get the Alakala Poison out of it. Later Indra, the king of Devas realised that, it was because they did not worship Ganesha before starting their mission. Lord Indra created this idol out of the foam (Kadal Nurai) and during his penance at Swamimalai, set the image down at Tiruvalanchuzhi, after which it became rooted to the spot.

https://www.google.com/search?q=Swetha+Vinayagar

House