INCORPORATE FRUIT AND FLOWERS. There's no doubt that plants and flowers add a freshness to any space. In living conditions that often don't permit pets, plants can be a welcomed living addition. Keep grab-and-go fruit around such as apples or clementines for people passing through and for your own enjoyment.
Flowers, fruit, and glass are great ways to add some nature to any space. Changing the colors of the fruit and flowers when you get bored allows you to have a different feel with minimal cost or effort.