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Before Diwali night, people clean, renovate and decorate their homes and offices. On Diwali night, Hindus dress up in new clothes or their best outfit, light up diyas (lamps and candles) inside and outside their home, participate in family puja (prayers) typically to Lakshmi – the goddess of wealth and prosperity. After puja, fireworks follow then a family feast including mithai (sweets), and an exchange of gifts between family members and close
friends. Diwali also marks a major shopping period in nations where it is celebrated.
We also put some electric lights on our houses, buildings to celebrate it. I've made some lights available at the top of the Forum to symbolize them. Enjoy!

PS.
1. Click on photo to see them opening in a nice layer.
2. Reference is taken from WIki.