I have a hunch that this might already be in the works, but way more scarf recipes. Even if the recipes were just the ability to make two- or three-tone scarves with the existing colors. Just doing two-tones with the existing colors gives over 100 options. Not all of them would be all that popular, but many of them would be, and it would add a nice collecting element.
It wouldn't involve making any new base materials and the new artwork for the scarves themselves should be very simple to make. You could just release one or two recipes monthly--maybe one that's thematic to the month and one that is just a random collector combo. This would provide years worth of content that should be pretty simple for the staff to create.