First cut the vegetable lengthwise or breadth wise to just make the shape of the flower leaves etc.
Take for example, take the capsicum, and cut it into two equal halves. On the brim of the capsicum piece just apply the paint and make sure that u do not smudge the paint. Punch the paint on the cloth like the petals of a flower. Then take the ladies finger and cut it into both length wise and breath wise. With the help of length wise cutting make the leaves and with the help of breadth wise cutting make the small flowers. To make the design more beautiful you can punch the small flowers at the corner of the cloth.