Rooms and objects you can put straight into a portfolio, shared by the people who made them. Open the builder, click Files, then Library to add any of these.
Object · Architecture · 7 KB · 104 triangles · starter pack
Credit: CC BY 4.0 — https://sketchfab.com/Brynnnnn — https://sketchfab.com/3d-models/low-poly-isometric-rooms-d53af0ad289a403598ee2cb41d84608b
Object · Decor · 11 KB · 432 triangles · starter pack
Credit: Webuild on CGtrader — https://www.cgtrader.com/designers/webuild?utm_source=credit&utm_source=credit_item_page
Object · Architecture · 3 KB · 32 triangles · starter pack
Credit: Modern Rooms by ankitrajput8161 on CGTrader — https://www.cgtrader.com/designers/ankitrajput8161?utm_source=credit&utm_source=credit_item_page