All Collectibles And Rewards

With the release of the new Collection system, there are brand new redemption or trade-in prizes for completing each collection.
In addition to the Farm Coins and XP, each Collection set has its own unique Level 1, Level 2, and Level 3 prizes. You can continue to level up your Collection after achieving Level 3, but the prizes will loop, with the addition of increasing the amount of XP and Farm Coins that you receive.
FarmVille Berries Collection:

Level 1 Prize: Farmville fertilized All (Consumable)
Level 2 Prize: Farmville Berry Crate (decoration)
Level 3 Prize: Farmville White Cherry Blossom Tree (decorativetree, note harvestable)

FarmVille Citrus Collection:

Level 1 Prize: Farmville Arborist (Consumable)

Level 2 Prize: Farmville Citrus Archway (decoration)

Level 3 Prize: Farmville zesty Pony (harvestable, breedable animalwith foal)

FarmVille Cows Collection:

Level 1 Prize: Farmville Fuel
Level 2 Prize: Flower Cow topiary (decoration)
Level 3 Prize: Farmville Rainbow Cow (harvestable, breedableanimal with Calf)

FarmVille Flowers Collection:

Level 1 Prize: FarmVille Farm Coins
Level 2 Prize: FarmVille Flower Basket (decoration)
Level 3 Prize: FarmVille Flowery Cow (harvestable, breedable animal with Calf)

FarmVille Grains Collection:

Level 1 Prize: FarmVille Farm Coins

Level 2 Prize: FarmVille Wheat Scarecrow (decoration)

Level 3 Prize: FarmVille Spring Water Mill (decorative building)

FarmVille Squash Collection:

Level 1 Prize: FarmVille Arborist (consumable)
Level 2 Prize: FarmVille Gourd Gnome (decorative Gnome)
Level 3 Prize: Pig Pumpkin (harvestable animal)