I love, love, love those cute fabric and/or ribbon flowers. If you're wondering how to make them, visit The Domestic Diva's blog. She has a great tutorial roundup of many places offering tutorials on different types of fabric flowers.
Fabric to match invitations and style. It's called Simple Abundance Bloom Sky Fabric by Bonnie & Camille for Moda. It sells for $4.49 per half yard there.