What is the meaning of Mehndi?

Mehndi are decorative designs made with hennna paste (a red-brown or orange-brown color) originating in ancient India. Mehndi designs are temporary patterns on the skin, popular in India for Hindu weddings and festivals.  Mehndi is considered a symbol of good luck, health and sensuality in the Arab world. Mehandi and henna can be used interchageably.

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The Sari Every Indian Woman’s Classic
A sari is a garment of Asian women that consists of several yards of lightweight cloth draped with one end  forming a skirt and the other a head or shoulder covering. The Indian sari is versatile, comfortable and colorfully expresses elegance and femininity.  The sari is made from a single strip of cloth, approximately six yards, which is then draped over the body in a variety of styles.

What color & style of kurta would go with a multi colored dupatta?
I am not familiar with Indian clothing styles. However a multi color dupatta (shawl, scarf) would work best with a simple style, solid color outfit (kurta) that is a color in the multi color dupatta. For example if your dupatta is red, yellow, blue & green, a kurta in one of those colors would look good.