The SparkFun LED Array is a set of 56 red LEDs arranged in a nice 8x7 grid.
Features: 3 1/2 LED digital panel meter. Single 9V DC-operation. High input impedance: > 100Mohm. Optional resistor set: PM/RES.
This Arduino-compatible module uses three TI TLC5940 PWM LED chips to drive a 4x4 array of RGB LEDs. Each color is controlled by a different chip so you can adjust the reference resistors for the appropriate current.
This large matrix has 64 Red, 64 Green and 64 Blue individual LEDs built into one common cathode housing. Unit comes with a black finish and a opaque LED lenses.
This medium matrix has 64 Red/Green LEDs built into one common cathode housing. Unit comes with a black finish and a opaque LED lenses.