The Italian Renaissance was artistic and cultural revival that borrowed many themes from ancient Greek and Roman societies. The influence that Renaissance artists had on the world can still be seen throughout Europe in historic settings like basilicas or art museums as well as in current designs.
Popular culture has romanticized this period of time in world history and many styles have been adapted to fit into a modern home. One way you can add a touch of Renaissance elegance to your decor is by revamping your bedroom.
Intricate wall murals were a common trend in many high society headquarters, including St. Peter's basilica or any of the Medici family villas. Installing wall paper or hanging large pictures depicting medieval scenes can recreate this effect.
As for furniture consider purchasing a four post bed to hang a whimsical canopy for a romantic effect. You can go for a regal feel by using silk drapes to make a tent like structure that can open and close.
In fact, using silk in any area of the room will contribute to your Renaissance theme. Covering your windows with silky curtains and drapes or using the fabric as your bed spread will increase the luxurious look of your design.
If you want to continue this theme into other areas of your house consider adding designs and textures to ceilings, especially of you have high ceilings. Use marble, tile and brick in geometric patterns for your floors. For the outdoor landscape consider adding fountains or marble statues in a flowery garden.