I made this small elegant lamp adding 5 simple sides, carved with some shapes of leaves.

Read instructions for assembly

For this small project you only need:
5 printed parts (print the .stl file 4 times)
1 Yellow Led
1 Coin Battery (3 V)
Hot Glue

(It's cheap, it will costs about 1€)

When you have printed the sides, you have to put them togheter with hot glue as the sides of a cube. Then you put the LED, connected to the coin battery, under the structure. Turn off the light and see how the light passes through the holes. It will create an elegant atmosphere.