Ardhendu, It depends on the overall size of the property and also the location. 12x12 could be ok as the guest room but it may be called smaller when it's a master bed room. Thanks, Nitin Cornerstone Designs, Bangalore.

It's very open ended question , pls share floor plan, pics and requirement details to get a better estimate.

Arshi, there are hundreds of way to decor.  Start with defining your requirements and appropriate budget to get meaning ful answers

Hi Irene, you need to share some pictures to be able to share some thoughts. Please check my Houzz profile for inspiration. Hope it helps!