Light

It is always best for a home or business to be well lit. Ideally, this means direct or diffused sunlight, as this is the most natural. Skylights are good Feng Shui.
Fluorescent lighting is not good Feng Shui as this type of lighting is missing the warm end of the spectrum. If you work or live under fluorescent lights, try adding some warmth with a wall lamp or a table lamp with a full spectrum bulb.
Recent studies have suggested that fluorescent lighting may indeed by hazardous to your physical and mental health.
Use spotlights and accent lights to highlight specific areas. Crystal prisms hung in windows will disperse white light into rainbow colours.

Colour

Generally speaking, any room should contain all the 5 elements. When selecting colour schemes, use the Promoting Cycle. That is Wood (green) promotes Fire (red, pink, peach), promotes Earth (brown, earth tones), promotes Metal (white, gray, silver, reflective), promotes Water (black, navy).
For example, a green carpet, with peach coloured walls, and a beige ceiling, earth tone couch & chairs, etc. can be accented with gold lamps, and navy pillows.
In this way all the elements are represented.
Some colours have special qualities. Pure Red, for example is considered to be an activating colour and able to cause great excitement or upset if overused.
Red accents are often used to activate an area. Red is also reserved for special occasions such as Chinese New Years when it is OK to get very excited.
Interestingly, recent studies in prison have shown that colour can indeed affect the emotions. Cell walls painted bubble gum pink had a profound calming effect on violent offenders. Fast food restaurants discovered some time ago that the colour Orange makes you hungry. Ever notice how many fast food joints are Orange?
Green is considered to be a colour that promotes growth and healing. If there is someone in your family in need of healing the colour green will help.

Smells -

The sense of smell is the most acute and most attuned to the emotions of all the physical senses. In modern industrial society, unfortunately, this is a fact that is often forgotten. It is said the nose is on the job 24/7 and very often we are not even aware of the effect certain smells have on us.
Popular scents in Feng Shui include Jasmine, Sandalwood, Ylang Ylang, Frankincense, and Myrrh among others. These scents are used to promote peace, tranquility and healing and all have aphrodisiac qualities, especially in blends.
With the popularity of modern Aromatherapy, there are many natural scents that one can use to enhance a home or business. Or you can do like the ancients and use incense or the natural plants themselves.

Pets

Domestic pets generally add life and positive energy to any domicile. The Emperor is said to have had thousands of caged birds in his residence to add life with their singing.
The Chinese did not actually keep dogs or cats as pets. In fact today it is actually still illegal to keeps cats or dogs as pets. They prefer birds and fish.

Jade

Jade is considered to be a sacred substance in Chinese lore. Any object made of jade will have magical power to attract good luck and good fortune.

Coin

Coins represent money and are best placed in the Wealth area to attract money. Valuable or rare coins are well placed here.

Flowers

Fresh potted flowers bring life and growth to any corner. It is best to use potted, living plants rather than cut flowers.
Neither cut flowers nor dried flowers are recommended as they are dying or dead and will tend to suck the life out of any space.
Plastic, metal, porcelain, or flowers made from fabric are OK, as are pictures of flowers to represent beauty, growth and to attract positive Qi. Still, fresh, living, plants are the best.

Scents

The following are some of the more common essential oil scents and their qualities.

Lavender - relaxation, calm, serene, peaceful, tranquility, comfort, soothing, restful, protection, cleansing and healing. Lavender repels insects, heals burns, scrapes and insect bites. It cleanses bad smells. Use when there is illness in the home. Use in the bathroom, kitchen, bedroom, living room and halls.

Jasmine - sensual, harmony, exotic, optimism, well-being, soothing, balancing, euphoric, comforting, inspirational, confidence, good luck in love, wealth building, aphrodisiac, alleviates depression and tension and raises self-esteem. Use in the bedroom, the living room, study.

Chamomile - soothing, sedative, relaxing, balancing, dissolves negativity, calming, stress release. Use in the bedroom before sleep.

Eucalyptus - stimulating, clearing, refreshing, cooling, purifying, disinfecting, energizing, uplifting. Use in the bathroom, kitchen, basement, attic, closets, laundry room and children’s room. Use anywhere when there is illness in the house or at work. Eucalyptus and Camphor are the two most used treatments for symptoms of the common cold and flu to open nasal passages and clear phlegm.

Lemon - cleanliness, freshness, stimulating, purifying, refreshing, energetic, motivating, positive, uplifting, clearing. Use in the kitchen, bathroom, basement, attic, closets. Try squeezing the peel of fresh lemons.

Orange - warming, uplifting, refreshing, energizing, cleansing, rejuvenating, joyful, purification, healing, abundance, happiness. Try squeezing the peel of fresh oranges. Use in kitchen, bathroom, basement, laundry room, attic, closets and entrances.

Patchouli - aphrodisiac, relaxing, balancing, uplifting, stimulates, purifies,prosperity. Use in bedroom, study, living room.

Rosemary - refreshing, stimulating, purifies, attracts energies, mentally revitalizes and rejuvenates. Use in the study, den, library, computer room, playroom, living room.

Ylang Ylang - aphrodisiac, calming, peaceful, relaxing. Use in the bedroom, living room, playroom.