My review of the Zig Brush Pens: 12 pens are plenty. You can make any color possible by mixing. I ordered 3 extra in pale colors, so I have 15. Easy to use, rich color. Not a necessity, but a lot of fun.
FUSE photo sleeve tool to the rescue. I have always saved my best samples for future replication, in a notebook. I had a box of cards that would not fit the sleeves. My FUSE put an end to that problem. Just put a seam on page protectors where you need it and problem solved.