The church has recently begun organizing an annual day of service. Help the Young Women in your ward organize different service projects to complete throughout the day.
One need that is frequently overlooked is child care during choir practices. Offer the service to the ward choir director and babysit for 1-2 months.
JustServe.org has local service opportunities listed in certain areas of the country, and is a great starting point for finding ways to serve.
If you have more ideas or a personal experience you want to share, send them to firstname.lastname@example.org