Falling Water - a take on Frank Lloyd Wright's famous design:
https://www.thesims3.com/assetDetail.html?assetId=2877652
https://www.thesims3.com/sims3_asset/sims3_asset/thumb/shard000/000/028/776/52/roof_up_original.jpg
A very mansion-esque design:
https://www.thesims3.com/assetDetail.html?assetId=7039274
https://www.thesims3.com/sims3_asset/sims3_asset/thumb/shard000/000/070/392/74/roof_up_original.jpg
A very modern make-over:
https://www.thesims3.com/assetDetail.html?assetId=9187144
https://www.thesims3.com/sims3_asset/sims3_asset/thumb/shard000/000/091/871/44/roof_up_original.jpg
