The red is just a little dirty with a touch of mildew but overall, pretty much looks the same.
The blue is the only one that I've seen change color at all, and it too has tiny chew marks in it.
For being out in the Minnesota weather and laying in the dirt for over a year, I'm really surprised at how well these have held up.
To celebrate the one year mark, I decided to move them from under the leaf litter back up to the top of the mossy stump again. I'm curious to see if they'll be hauled off again. Maybe they'll be some squirrel's decoration for Thanksgiving... I'll check back next spring to see what remains.
'til then, little acorns.