NOTE: author of this thread is kekvitirae.

I have been compiling a list of things in certain levels which are essential to a high score. The following are a list of the items that give blue flowers (points) and gold flowers (lots of points). So far, I only have Lady Luck completed. I bolded my comments since a few are a little confusing to distinguish.

Lady Luck
Note that despite their relationship to wealth, poker chips do NOT count as Rich. They are, however, great for picking up size.

Gold:

Bill
Brooch
Crown
Deer Head
Diamond
Diamond (small ring)
Diamond Ring
Emerald (small ring)
Gold Bar
Gold Coin
Gold Lighter
Gold Watch
Gold Pieces
Jewelry Box
Miki Matarai
Onyx (small ring)
Ruby (small ring)
Set of Bills
Silver Coin
Steak

Blue:

Beetle Fight
Big Plate
Brand Name Bag
Bunch of Roses
Candlestick Set
Champion Burger
Champion's Belt
Champion's Trophy
Chandelier
Chocolate Cake
Chocolate Parfait
Cream Puff
Curry Roux
Earring
Emblem
Expensive Bottle
Feather Pen
Flagstick
Flower Bouquet
Fruit Plate
Fukuko Shinozaki
Garden Plant
Grape Juice
Guitar
Ham And Melon
Handbag
House Plant
Lemon Tea
Luxury Chair
Luxury Flower Vase
Luxury Plate
Magic Lamp
Melon
Melon Drink
Monster Apple
Monster Cherries
Monster Melon
Nail Polish
Novelty Plate
Paula (Cousin)
Pear
Perfume
Photo Stand
Pineapple Drink
Pocket Watch
Portrait
Purple Butterfly
Pumps
Red Grape Juice
Rider's Portrait
Ring Box
Rocking Chair
Rose
Roulette
Scimitar
Sea Urchin
Shaker
Shield
Ship in a Bottle
Shortcake
Soda Drink
Sparkling Bottle
Stand Clock
Still-life Painting
Strawberry Parfait
Stylish Key
Sweetheart Chocolate
Sword
Sunglasses
Tart
Tea Jar
Teapot
Teaspoon
Top Hat
Trophy
Tropical Plant
Woman's Portrait
Yellow Swallowtail

Oasis Cafe
Try making a beeline toward the upper shelf where the "sushi monster" is running around when you start out. There are a lot of coffee milk packets up there that are hard to roll up when you get bigger.
This is also one of the easier levels to get 120 points with. There are a lot of Drinks laying around, and virtually all fruits and vegetables count toward this score. Just get over 85m and roll up everything in sight.

Blue:

Apple
Banana
Banana Bunch
Blender
Blue Hawaii Shave Ice
Bottle Cap
Canned Sweets
Carrot
Cat-free Bottle
Cereal
Cherries
Chinese Spoon
Chocolate Parfait
Cup Noodles
Frozen Yogurt
Fruit Jelly
Giant Strawberry
Gift Set
Gourd
Half Watermelon
Ice Cream
Jumbo Ice Cream
Kid's Jelly
Mandarin
Mandarin Piece
Medicine Bottle
Melon Shave Ice
Monster Apple
Monster Melon
Noodles with Kitsune
Onion
Pear
Persimmon
Pineapple
Rabbit Apple
Strawberry Parfait
Strawberry Shave Ice
Sugar Cube
Tomato
Toothpaste
Tube Sherbet
Twin Pop
Watermelon
Yellow Squash
Yogurt Cup
Yogurt Drinks

Gold:

Apple Juice
Baby Bottle
Coffee (Can)
Coffee Milk
Coffee Milk (tiny)
Drink
Glass Bottle
Green Tea (Can)
Ice-cold Drink
Ice Cream Float
Japanese Bottle
Japanese Cup
Kettle
Large Milk Carton
Lemon Tea
Milk Bottle
Milk Box
Milk Carton
Orange Juice
Pet Bottle Juice
Round Water Canteen
Soda
Soda Bottle
Sports Drink
Tea Can
Teacup
Teapot
Tetrapack Milk
Thermos Pot
Water Canteen