In the facebook version of Mafia Wars, collections sets of items that drop randomly while doing jobs. Each collection is tied to a specific job tier (i.e. soldier, enforcer, hitman, etc.) and the items from each collection a chance to drop when doing jobs of the corresponding tier. When you collect a full set, you can "vault" the items (an option under the inventory tab) for a permanent stat bonus.
Here is a list of the collections available in Facebook's Mafia Wars and the rewards available for collecting each set of items:
Mafia Wars: New York Collections
Street Thug Tier:
Diamond Flush Collection - Reward - +1 energy
Items in set: Eight of Diamonds, Nine of Diamonds, Ten of Diamonds, Jack of Diamonds, Queen of Diamonds, King of Diamonds, Ace of Diamonds
Associate Job Tier:
Heart Flush Collection - Reward - +5 Health
Items in Set: Eight of Hearts, Nine of Hearts, Ten of Hearts, Jack of Hearts, Queen of Hearts, King of Hearts, Ace of Hearts
Soldier Job Tier:
Sculptures Collection - Reward - +3 Defense
Items in Set: Rat Sculpture, Sheep Sculpture, Rooster Sculpture, Tiger Sculpture, Snake Sculpture, Dragon Sculpture
Poker Chips Collection - Reward - +2 Attack
Items in Set: White Poker Chip, Brown Poker Chip, Red Poker Chip, Blue Poker Chip, Green Poker Chip, Purple Poker Chip, Gold Poker Chip
Club Flush Collection - Reward - +3 Attack
Items in Set: Eight of Clubs, Nine of Clubs, Ten of Clubs, Jack of Clubs, Queen of Clubs, King of Clubs, Ace of Clubs
Boxing Collection - Reward - +3 Attack
Items in Set: Hand Tape, Gloves, Headgear, Boxing Trunks, Speed Bag, Heavy Bag, Boxing Ring
Enforcer Job Tier:
Cigars Collection - Reward - +2 Energy
Items in Set: Ebony Cigar, Sky Cigar, Rose Cigar, Ivory Cigar, Turquoise Cigar, Gold Cigar, Royal Cigar
Spade Flush Collection - Reward - +2 Stamina
Items in Set: Eight of Spades, Nine of Spades, Ten of Spades, Jack of Spades, Queen of Spades, King of Spades, Ace of Spades
Billiard Balls Collection - Reward - +1 Stamina
Items in Set: One Ball, Two Ball, Three Ball, Four Ball, Five Ball, Cue Ball, Eight Ball
Hitman Job Tier:
Rings Collection - Reward - +5 Defense
Items in Set: Topaz Ring, Opal Ring, Amethyst Ring, Emerald Ring, Sapphire Ring, Ruby Ring, Diamond Ring
Ties Collection - Reward - +6 Defense
Items in Set: Solid Tie, Striped Tie, Checked Tie, Geometric Tie, Dot Tie, Paisley Tie, Knitted Tie
Capo Job Tier:
Paintings Collection - Reward - +6 Energy
Items in Set: Warhol Painting, Cezanne Painting, Matisse Painting, Van Gogh Painting, Dali Painting, Monet Painting, Rembrandt Painting
Cufflinks Collection - Reward - +10 Health
Items in Set: Silver Cufflinks, Gold Cufflinks, Amber Cufflinks, Jasper Cufflinks, Agate Cufflinks, Onyx Cufflinks, Pearl Cufflinks
Barber Shop Collection - Reward - +4 Energy
Items in Set: Barber Pole, Razor, Brush, Seat, Towel, Scissors, Cream
Consigliere Job Tier:
Great Race Horses Collection - Reward - +7 Energy
Items in Set: Mill Reef, Sea Bird, Arkle, Golden Miller, St Simon, Ormonde, Eclipse
Mafia Wars: Cuba Collections
El Soldado Job Tier
Rum Drinks Collection
Reward: +8 energy
Items: Pina Colada, Hurricane, Bahama Mama, Mojito, Rum Runner, Long Island Ice Tea, Cuba Libre
El Capitan Job Tier
Tropical Fruits Collection
Reward: +3 Stamina
Items: Banana, Lime, Pineapple, Papaya, Coconut, Passion Fruit, Dragon Fruit
El Jefe Job Tier
Entertainers Collection
Reward: +10 Health
Items: Magician, Fan Dancer, Comedian, Band Leader, Cabaret Singer, Crooner, Burlesque Dancer
El Patron Job Tier
Tropical Fish Collection
Reward: +5 Attack
Items: Pufferfish, Sergeant Major, Yellowtail Snapper, Great Barracuda, Queen Angelfish, Reef Shark, Blue Martin
El Padriano Job Tier
Beards Collection
Reward: +7 Defense (also an achievement)
Items: Garibaldi, Hulihee, Vandyke, Mutton Chops, Soul Patch, French Fork, Fidel
