I combined the SCS Technique Lover's Challenge (to pop up a portion of your sentiment) with the CAS Challenge to use these colors: hot pink, kraft, celery green, white. It's not exactly a one layer card - lol - but hope all the white space will qualify it as CAS.
STAMPS: Ruby Rose (PTI), Hearts a Flutter (SU)
PAPER: True Friends 6x6 pad by Carta Bella, Neenah Solar White
INK: Pretty in Pink, Certainly Celery, Crumb Cake, Versafine Onyx Black
ACCESSORIES: Ruby Rose dies (PTI), Jute twine, Button, Hearts a Flutter framelits die (SU).