Incorporating Feng Shui into your home will help to increase your luck in Animal Crossing: Wild World -- literally!
Having a lucky home will help you to catch rarer fish, plant and grow money trees more successfully, increase your HRA rating and more!
You can incorporate Feng Shui into your home by following the simple color grid below.
The following is a representation of the main floor in your Animal Crossing home.
Original layout:

After first expansion:

After second expansion:

Each color refers to the type of furniture that will count for Feng Shui in that grid section. The grid sections that contain multiple colors (green and yellow, or green and red) work for either of those two colors.
Place red furniture on the right side of your home, yellow furniture on the left and green in the front.
List of items and their Feng Shui colors:
Note: Bolded items are worth double.
Red Furniture Items:
Apple Clock (also yellow)
Apple TV
Barbecue
Basic Red Bed
Bonfire
Bromeliaceae (also green)
Campfire
Candy Machine
Clear Model
Daffodil
Detour Arrow
Dharma
Doghouse
Dolly
Executive Toy
Extinguisher
Fire Hydrant
Garden Gnome
Gas Pump
Gerbera
Giant Dharma
Handcart
Haz-Mat Barrel
Iron Frame
Jackhammer
Lantern
Lawn Mower
Life Ring
Mansion Model (also green)
Metal Guitar
Metronome
Mini-Dharma
Miniature Car
Mush Bed
Mush Stand
Mush Table
Mush TV
Music Box (also yellow)
Nice Painting
One-Story Model (also green)
Orange Cone
Pagoda
Quince Bonsai
Red Armchair
Red Boom Box
Red Clock
Red Corner
Red Drum
Red Sofa
Red Vase
Rocket
Sandbag
Saw Horse
Sleigh
Snowboard
Stool
Stove
Throne (also yellow)
Tiki Torch
Traffic Cone
Trash Bin
Tulip Chair (also green)
Tulip Table (also green)
Two-Story Model (also green)
Vacuum Cleaner
Watermelon Chair (also green)
Watermelon Table (also green)
White Golf Bag
Green Furniture Items:
Aloe
Azalea Bonsai
Baby Panda
Basic Green Bed
Big Festive Tree
Billiard Table
Bird Bath
Bomeliaceae (also red)
Cactus
Caladium
Clothesline Pole
Coconut Palm
Corn Plant Dracaena
Daffodil Chair (also yellow)
Daffodil Table (also yellow)
Deer Scare
Desert Cactus
Fan
Fan Palm
Festive Tree
Froggy Chair
Glow Clock (also yellow)
Grapefruit Table
Green Bed
Green Bench
Green Chair
Green Counter
Green Desk
Green Dresser
Green Drum
Green Golf Bag
Green Lamp
Green Lava Lamp
Green Pantry
Green Table
Green Wardrobe
Hawthorn Bonsai
Holly Bonsai
Hospital Bed
Iris Chair
Iris Table
Jade Econo-Chair
Lady Palm
Lemon Table (also yellow)
Lily-Pad Table
Lime Chair
Mahjong Table
Mansion Model (also red)
Melon Chair (also yellow)
Mugho Bonsai
Museum Model
Nook's Cranny
Nookway
One-Story Model (also red)
Pachira
Pear Dresser
Pear Wardrobe
Pine Bonsai
Ponderosa Bonsai
Pothos
Ranch Armchair
Ranch Couch
Ranch Tea Table
Retro Fridge
Robo-Lamp
Rock Guitar
Round Cactus
Rubber Tree
Ship Cannon
Sleeping Bag
Snake Plant
Sunflower (also yellow)
Table Lamp
Tall Cactus
Tea Set (also yellow)
Tennis Table
Train Set
Treasure Chest (also yellow)
Tulip Chair (also red)
Tulip Table (also red)
Two-Story Model (also red)
Washer/Dryer
Watermelon Chair (also red)
Watermelon Table (also red)
Weeping Fig
Yellow Furniture Items:
Alarm Clock
Apple Clock (also red)
Basic Yellow Bed
Blue Bed
Blue Table
Bug Trophy
Candle
Cash Register
Cement Mixer
Classic Sofa
Clothes Closet
Daffodil Chair (also green)
Daffodil Table (also green)
Diver Dan
Elephant Slide
Exotic Lamp
Fish Trophy
Flower Trophy
Flowery Painting
Flying Saucer
Glow Clock (also green)
Gold Econo-Chair
Gold Stereo
Hi-Fi Stereo
Jasmine Bonsai
Judge's Bell
Jukebox
Kayak
Lefty Lucky Cat
Lemon Table (also green)
Lucky Cat
Lucky Gold Cat
Lunar Lander
Mama Bear
Melon Chair (also green)
Mountain Bike
Mummy's Casket
Music Box (also red)
Odd Clock
Oil Drum
Phonograph
Picnic Table
Pineapple Bed
Portrait
Pyramid
Rare Painting
Regal Lamp
Samurai Suit Bow
Screen
Snowman TV
Sphinx
Sprinkler
Steam Roller
Striped Cone
Sunflower (also green)
Sword
Tea Set (also green)
Tea Vase
Throne (also red)
Treasure Chest (also green)
Also, there are certain "lucky items" that will grant you luck when placed in your home, regardless of what their color is and where you place them. HOWEVER, placing them in one of the four corners of your home will grant you double that luck.
Lucky Items:
Big Festive Tree
Birthday Cake
Bug Trophy
Dracaena
Festive Tree
Fish Trophy
Flower Trophy
Garden Dnome
Ivory Piano
Jack-in-the-Box
Lefty Lucky Cat
Lovely Phone
Lucky Black Cat
Lucky Cat
Lucky Gold Cat
Music Box
Piggy Bank
Portrait
Racoon Figurine
Samurai Suit
Treasure Chest
Washer/Dryer
Thank you so much to BLUE SCREEN OF DEATH for organizing the items into alphabetical order!
also, safety message; please do not use this guide without my permission. only saying this because i saw another guild steal guides out of our forum and use them in theirs without crediting the writers, i dont think thats fair to the writers. thanks