This can be used to make a great-looking treasure chamber.
You can make a house (or other structure) for each of those themes. For example, take a look at the different Doors that are available. Themed Houses: There are many furniture themes in Terraria.This allows you to easily buy items that NPCs only sell in specific biomes. Outposts: You can build outposts in the different biomes, usually in the style of the biome it is built in.Make sure to use some more natural blocks and walls to make it look better. Tree House: You can either build your own tree house or edit a Living Tree.Using some Wooden Beams, Planked Walls and torches, you can make a simple and good-looking mine for yourself.
Mine: Not only is it handy to have direct access to a large mine, but it looks great too.Use your own imagination to build it the way you like it.
For colors the Gray Bricks and Red Bricks combine well, while some more expensive bricks may look good for the throne room. A good way to build a more interesting castles is by building some tower tops of varying sized and varying heights, and then connecting them. Of course you can build a simple symmetric castle, but this tends to look rather boring. Castle: One of the most popular constructions in Terraria is a castle.All NPCs have some items that suit their theme, allowing you to build nice houses for all. Add some Plants and a Flower Wall to the house of your Dryad, some Bottles and a Bed for your Nurse, a Crystal Ball for your Wizard, an Ammo Box for your Arms Dealer, or some Christmas decorations for Santa Claus. NPC Houses: Some simple decorations can quickly turn any house into one that fits the theme of a NPC.Remember that paint is cheap - if you like the pattern or texture of a block or wall, but it's the wrong color for your build, change the color! In version 1.4, The Graveyard with Ecto Mist allows crafting a variety of special walls, as well as a few blocks such as gem-encrusted stone. Reshape your map and create varied structures, ranging from elegant simplicity to intricate complexity, realistic to fantastic, and from the beautiful to the terrifying or hideous. Terraria is a sandbox offering vast opportunities for creativity. Make a teleporter system for another form of easy transportation.Try to collect one of every critter in the game.Try to collect one of every fish in the game.Craft complex items like the Zenith, Cell Phone, Ankh Shield, Terraspark Boots, or the three title screen Music Boxes.Make complex devices with Mechanisms, Wiring, and Hoiks.Multi-boss fight: If you have defeated every boss in Terraria, try summoning and fighting multiple bosses at once.Make it more challenging by adding a few obstacles in the arena and close off the arena to prevent the prey from escaping. Then use a gun to shoot at the spawned creatures. Shooting Range: Connect one or more Bird Statues (or even other statues including enemies) to a Timer or a Switch.Traps and other structures for farming monsters.Skybridges and railways for similar travel across the map.Hellevators for rapid travel upwards and downwards.
However, if you didn't build one in the current world you are playing in, try them now! Feel free to browse the Terraria forums for ideas and inspiration. You probably already built some of the building projects, try upgrading them.