It's not really an "innovative" idea but I'd love to see more things that you can use in plant pots, I have around 80 plant pots and just find myself wondering what's worth planting, I have more bell peppers than I'll ever need and tried planting all the other things (in hopes of getting something completely different), the only ones that tend to be "good" are baby bears, sun flowers and the odd devil wort/garlic for cooking/inspirational.
Would be nice to be able to plant: tomato plants, lavender blewits, herbs/spices, carrots, peas, etc.
Also a lot more chances for them to change into different things like with the new world gourd to make it more "exciting" seeing what you'll receive from planting,
again it's not an original/innovative idea, but just something that I'd like to see in the future (if it's not already planned).