I just finished my first one and must say that eventhough I didn't have a sample plastic bag it turned out quite well. The bag is all blue: green and blue stripes on the outside and basic plain blue on the inside with a pocket made from leftover "outside" fabric.
Next time, the handles will definitely be longer since it was really tight sewing french seams on the handles. But nevertheless the bag is nice and roomy
Thank you sooo much for the idea! I will definitely come back to it again!