apply template to asp.net site

I have a asp.net application. i have 4 different domain names and I want to implement this application as 4 different sites. Each site is same application with same database at the backend but is a different site due to difference in design and layout. I have 4 different templates for this. I need someone to apply the templates as masterpages with changeable themes and provide the backend admin feature to add these masterpages. Most Experienced coder with lowest bid will win the bid.