I've used this background stamp multiple times and have had great results with each color combo. We need to try new color combos to really explore all the options that you may be missing.
I heat embossed a background stamp by Hero Arts with Versa Mark ink and clear embossing powder onto Ranger's watercolor paper. I pulled out the Peerless water colors and the Ranger water pen to mix the colors into the floral pattern. After it dried I trimmed it down and matted some purple cardstock behind it. I used the same purple cardstock for the sentiment (stamp and black ink by Hero Arts).There's yellow cardstock behind the purple on the sentiment.
Here are my other cards using the same background stamp:
Thanks for looking.