Rangoli is a traditional Indian decoration and patterns which is made of ground rice. You can have it in various colours. Normally, during the festivals such as Diwali or Navratri or any other Indian festivals, Indians normally decorate the entrance of their homes or even the front yards with these Rangolis.
Rangolis are very beautiful indeed. Normally, they used to do it as per their own designs but nowadays, it has become more easier with these Rangoli Stencils you are seeing below. The designs are here, you just have to add the colours in them and they are done.