There are no patron saints of Earth Day. However, since Earth Day has all to do with the environment and ecology, St. Francis of Assisi and Bl. Kateri Tekakwitha are the patrons of both of those.
Saint Marcella is Patron of Noblewomen. The Feast Day of Saint Marcella is January 31.
Your primary patron saint is the saint for whom you are named. A secondary patron saint would be the saint whose feast day is celebrated on your birthday.
There isn't a specific patron saint of the Earth in traditional Christian teachings. However, St. Francis of Assisi is known for his love of nature and animals, making him a popular figure for environmentalists and those concerned with caring for the Earth.
St. Michael the Archangel is a patron saint of grocers.
England's patron saint is St. George, who is commemorated on April 23rd.
St. Andrew the Apostle is one of several patron saints of Scotland and his feast day is November 30.
St. David is the patron saint of Wales, much like Saint Patrick is the patron saint of Ireland.
There is no saint named Ashleigh. Your other patron saint would be the saint whose feast day falls on your birthday.
I can find no reference to a St. Colin. However, there was a Saint Collen whose feast day is May 21. He is not a patron saint.
The feast of Saint Andrew, a patron saint of Scotland, is observed on November 30.
The patron saint of garage workers happens to have his feast day today, December 1 - Saint Eligius.
Usually your primary patron saint is the saint for whom you are named. Your other patron saint is the saint whose feast day falls on your birthday. You also choose a patron saint when you pick your confirmation name.