You can create a reactive LED coffee table using Arduino micro https://www.youtube.com/watch?v=fxkEPKGgv8o&feature=youtu.be
Method to Control 8*8 LED Matrix using Shift Register IC 74595 and Arduino Mega « Funny Electronics
Picture of Intro to LED Strips
Make an Arduino Mega 8x8x8 RGB LED Cube for awesome visuals! http://www.instructables.com/id/Arduino-Mega-8x8x8-RGB-LED-Cube/
Completing an Arduino project gives you a sense of satisfaction like no other. Most beginners aren't sure where to start though, and even beginner's projects can seem rather daunting.
Gorgeous, glowing, programmable LED cube.
RGB Arduino LED Clock
Electronic projects: Arduino LED clock (Scheduled via TrafficWonker.com)
Picture of How to control Stunning RGB LED Strip using Arduino Nano