These are the most beautiful Rangoli Designs/Patterns I found on Flickr. I hope these will be useful in making your own Rangoli designs.
© Murli Nambiar http://www.flickr.com/people/murlinambiar/
© Black Sapphire http://www.flickr.com/photos/blacksapphire/
© Ankita http://www.flickr.com/photos/68440691@N02/
© Ankita http://www.flickr.com/photos/68440691@N02/
© Preethi Rajaganesh http://www.flickr.com/photos/preethirajaganesh/
© Preethi Rajaganesh http://www.flickr.com/photos/preethirajaganesh/
© Preethi Rajaganesh http://www.flickr.com/photos/preethirajaganesh/
© Preethi Rajaganesh http://www.flickr.com/photos/preethirajaganesh/
© Pooja Sinha http://www.flickr.com/photos/21473042@N02/
© JWR Weatherley http://www.flickr.com/photos/weatherley/
Spotted a nice one, post in comments, so everybody will know.