This is a modern mansion primarily composed of; Sandstone, Glass, Grey Clay, Birch Wood, and Nether Brick. This took me about 4 hours in creative with the use of World Painter for the trees and the lake.
I highly recommend using Modern HD as I built this house with that texture pack.
Feel free to modify and have fun with this house. Use it for ideas or whatever you want.
UPDATE: The mansion has been thoroughly updated!!! Thank you everyone for your fantastic feedback.
The mansion now includes:
Updated Interior - including new room layout and additional basement with Theatre.
A Stable and fenced area for horses.
A Tennis Court.
A Hot Tub and Vineyard.
Updated Lake side seating and Barbecue.
Additional Barbecue and seating closer to mansion.
Optional Terrain (Terrain includes small cabin within mountain range).