Kantha is extremly simple yet beautiful style of embroidery. Stitch is simple running stitch that gives very beautiful. This is very popular in West Bengal & Bangladesh. Embroidery vastly used in quilt and sarees but could be made into different objects like bags, cuhions, curtains, toilet accessories holder. Kantha means rags. Precious silks and expensive clothes on becoming old were piled into layers and stitched together.
As I said style is simple running stitch but can be differentiated into aligned and non-aligned kantha.
Below I've given simple illustration of 2 types of kantha and some kantha patterns.
Kantha can transform a simple and plain thing to stylish and beautiful one. Below is the before n after effect of cushion and curtain (funny though...I just tried my hand on photo editting s/w) its just an illustration but by little creativity n good imagination u can do wonder.
Before:
After:
As I said style is simple running stitch but can be differentiated into aligned and non-aligned kantha.
Below I've given simple illustration of 2 types of kantha and some kantha patterns.
Before:
Look at this beautiful kantha shawl.
Image source: click here
Even I also made sarees and Salwar kameez using kantha. Kantha work is also used to depict the life story of an artist.
There are various styles of embroidery in India & from different regions and it would be an enormous task to cover all of them in one small post.
Colourful cushion covers from 
Door hanging from 
Hand Embroidery bed cover from 
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This white on cream is a dream:-) from 
Love this from 
Silver & Gold from 
Lovely combination from 
My mirrorwork cushion cover picked up from a Crafts Fair:-)