Sometimes all it takes to set the mood is your iPhone and 18 LED lights. That's the theory behind Holi, a sleek and colorful lamp powered by your smartphone. The minimal, square device — which is already available in Europe — lets you control its pulsing lights in three different ways. You can pick an ambient theme and the lights will flash and change colors to go along with your choice (there's also the option to create your own theme, letting you edit both the color and dynamic movement).