Using patterned paper in CAS design is a bit tricky. Too much pattern can sometimes take away from the design. I find that using it in small doses and pairing it with black and white is a sure fire way to keep your design clean.
You also want to make sure that you stay away from busy patterns on CAS cards, though I do have a trick up my sleeve on how to use those too. I'll be sharing that soon, so stay tuned!
Penny Black Products
51-136 Stitched Edges
80-009 Painted Blooms