This was fascinating to see! There were definitely some I would buy if they were ever released, such as the birth month gemstones. I thought the found numbers theme was fun, but they seemed surprisingly quirky for a stamp theme, so I'm not surprised it never saw the light of day.
When I saw the Sweet Corn design, I thought wait, isn't that a success story? Goes to show some themes can be revived! Michael Doret, the designer, did a brief bit on it in his design portfolio:
https://www.behance.net/gallery/228...Part-1-of-2. I wonder if there are any stamps with a similar design story. 12 years is quite a while.