The simple act of inviting a Buddha, Bodhisattva, Goddess, Deity, Immortal or a Saint in your home or workplace will shower upon you wonderful blessings of peace, luck and protection. Having a Sacred Image can immediately transform negative energy into positive ones, and if the energy is all positive, it can ensure that the energy stays positive.

Sun Wukong aka Monkey God aka Pilgrim aka ‘Great Sage, Equal to Heaven’ is a very powerful wealth and protector god. He is one of the few deities worshipped both in Taoism (also spelled as Daoism) and Buddhism.

Avalokitesvara or Kuan Yin is known as Cannon in Japan. Notice that even though the image looks feminine, the breast is exposed and its flat signifying a breast of a man. This is to signify that Kuan Yin has no gender.
Constantly seeing the images of Buddhas, Bodhisattvas, Deities, Immortals, or Saints will also subconsciously connect us to higher form of consciousness.
While I prefer actual images of the Buddhas and Bodhisattvas, etc. Other sacred objects like Prayer Wheels, Stupas, or the Koran for Muslims or the Bible for Christians will also do.

An indoor stupa is only effective if it either has a relic or a sutra or mantra inside it. A real relic is very rare though.
DO READ THE OTHER ‘SPECIAL ENERGIZING BUDDHIST, TAOIST, AND FENG SHUI RITUALS TO BRING FINANCIAL, CAREER, AND PERSONAL SUCCESS’ ARTICLES: (1) Tap the Power of the Sun’s Yang Energy; (2) Tap the Power of the Buddhist and/or Taoist Auspicious and Sacred Symbols by Displaying Them at Your Home or Workplace; (3) Upsurge the Yang Energy of Your Front Door and Living Room; (4) Wear Some Mantra or Seed Syllable as Jewelry; (5) Put Sacred Objects/Images in Your Home and Workplace; (6) Read Sacred Texts to Imbibe Different Kinds of Blessing; (7) Make Peace with the Spiritual Realms Through Incense, Holy Sound, and Mantras.