My children are still obsessed with stickers and we use them as reward (they are given 1 sticker each) or to keep them awake in the car so that they will have their long nap at home (they get given 1 sheet of stickers each in this scenario).
On this occasion, we were "resting" under the patio after lunch and this happened.
I was either being rewarded for being a particularly good mummy or seen as an alternative to a sticker book. Regardless, I was tickled pink and fascinated by her actions.
Have a splendid weekend with your family and keep making memories,