8x5 WS2812 RGB Led Matrix Shield with integrated electronics for Arduino (Neopixel compatible)

To make it easy to start, the LEDs are powered from the 5v onboard Arduino supply. As long as you aren't lighting up all the pixels full power white that should be fine. You can also solder in the included terminal block (pro-tip: put it on the bottom of the board so it doesn't stick up) to attach an external 4-6VDC power supply.

If, say, you need MORE blinky, you can chain these together. For the second shield, connect the DIN connection to the first shield's DOUT. Also connect a ground pin together and power with 5V. There you go! You can chain as many as you'd like although after 5 or more shields you may run low on RAM if you're using an UNO.