1. Colors, Fragrance, &beauty with Flowers and Vases:       

The interior of a room or any nook can be done beautifully by adding plants and flowers strategically. Around Diwali, you can buy bouquets from vendors selling them on the streets and put them in a wide variety of Vases. You can also use artificial flowers and leaves to decorate. The vases can be of any variety made of glass, rubber, fiber, or metal depending on the rest of the interior. 

2   Lights, candles, and Diyas:

One can beautify any room by adding fairy lights. Though most people prefer to add fairy lights to decorate balconies and exteriors, they can also be used inside the house to spruce up windows, mirrors, and walls. Beautiful sce

Beautiful scented or non-scented, white, or colorful artificial candles are a must-have decoration item. You can arrange them in glass tea-light holders, float them in Urulis or place them in earherndiyas.

Many different chandeliers and other not-so-expensive light fixtures can also be added to improve interiors. There are glass bell jars, aesthetically pleasing lights, and other options to help you elevate the space without spending heftily. There are these clips with lights to clip on photographs and create a hanging wall feature. 

3. Wall:

If you are not interested in painting the entire house, you can simply add an accent to the room by painting a single wall or you can use wallpaper to bring character to the wall. Also there are wall stickers that can be put on wall and accentuate overall look of the room.

Alternately wall metal and wood decoration items can be hung. Some other options are paintings, wall clocks, wall accents, Macramé hangings etc. 

This task does not require you to invest weeks and thousands into it and instantly liven up any room.