I have never seen these cards, but it is great idea to plan a big project beforehand. Although I love to craft and paint, I am not good in visualisation, I always need to see the colors before I can decide if I will like the result. If I am honest I feel like I have not such a good eye for color combinations.... But both of yours are amazing. Especially the pink one (I am predictable). While glancing at the photo where you used the yarn I at first thought you have knitted the swatches in garter stitch (and I was hugely exited :-DDDD).
I am looking forward to the finished broomstick lace set for your mother. The technique is so cool 💕🌈