This is totally a personal choice kind of question, but I went to fatquartershop.com, selected Charm Packs, View All, and came up with a list of "springy" color ones:
the Birds and the Bees
Cherry on Top
Good Morning
Gypsy Girl
Honey Honey
Ladybug Garden
Notting Hill
Sakura Park
Ticklish
Avalon
Chinoise
Happy Go Lucky
Happy Kaffe Fassett
Blues Kaffe Fassett
Mill Book Series circa 1835
Rose Cottage
Pay no attention to that weather outside...spring is COMING!!!