Here is an (incomplete) list of quilts that you can make with 15 Fat Quarters! If you click on the link, it will take you to the page where you can purchase and/or download the pattern:
Throw Size
- Origami Quilt by Blossom Heart Quilts (Throw)
- Finished size: 63" x 75"
- Background Fabric: 2 2/3 yard
- Binding Fabric: 0.5 yards
- Backing Fabric: 4.5 yards
Photo by @blossomheartquilts
Bed Size
- Hopscotch II by Quilty Love (Twin)
- Finished size: 75" x 95"
- Accent Fabric: 3/4 yard
- Background Fabric: 3 1/4 yard
- Binding Fabric: 3/4 yard
- Backing: 5 3/4 yards

Photo by Quilty Love
- Mod Mountains by Suzy Quilts (Twin)
- Finished size: 69" x 90"
- Background Fabric: 4 3/4 yard
- Binding Fabric: 5/8 yard
- Backing: 5.5 yards

Photo by @suzyquilts
- Compass Star Quilt by Quilty Love (Twin size)
- Finished size: 74" x 88"
- Background Fabric: 4 1/2 yards
- Binding Fabric: 2/3 yard
- Backing Fabric: 5 1/3 yards

Photo credit: Quilty Love