In vanilla Minecraft, especially without any texture packs, it can be difficult to create detail, particularly interiors, with the blocks available to you. Fortunately, a little creativity is all that’s required to start reinventing the game’s basic items to suit your needs.
The wooden stair block with signs on either side is a classic stand-in for a chair, with a pressure plate on a fence making a table to match. A leaf block over a dead bush in a pot makes a nice indoor tree; banners can serve as curtains; an iron trapdoor works as a great stovetop – blocks can serve as all kinds of other things.