The CAS Challenge # 164 is a sketch, which is actually quite a simple idea as you can see below.
Here's my take on the sketch. I used the Friends & Flowers stamp set and punched out the stamped circle images and then snipped into the ones on the top layer. This gives them a little added texture as you can see from the second photo.
The Designer Series Paper comes from the 2014-2016 Designer Series Paper Stack. The paper stack and all the 2014-2016 In Colors will be retiring at the end of May. The Lost Lagoon and Blackberry Bliss are my two favourites out of the five colours and I'll be sorry to say goodbye.
I kept the inside very simple and decorated it using washi tape. Love, love, love washi tape. It's great for decorating all sorts of things and I have on occasions used it to mask part of a stamp that I did not want to ink up. You just have to remember to peel it off before you put the stamp to paper.