You are looking for 2 set of information.
1) Interior Decoration: For this purpose, either you should hire a full time interior designer who would decorate all rooms to your choice. You can start by looking at the picture gallery and start collecting ideas for various parts of your house.
Once you have selected the ideas you can show them to your contractor to execute.
2) Heat resistant interiors: For making a home stay warm in winters you can read the article below
Along with this, once you chat with the insulation people in your area they would be able to help you with more options available to them.
Please send us a note if you have more queries. Regards