These are all round robin ATCs (and AT Coins) which I was the third person to add something to. I added quite a lot to this first set, as they came to me quite plain (though pretty):
With this set, I added less, as they were fuller to start with.
These I wasn't really that sure what to do with, but in the end, I think they worked ok. The bird sticker is gold and shiny, but didn't scan well.