Digispark Charlieplex http://digistump.com/products/13 using this charlieplexing library http://playground.arduino.cc/code/charlieplex

Charlie.ino

#include <Charlieplex.h>

#define NUMBER_OF_PINS 5
byte pins[] = {0,1,2,3,4};
Charlieplex charlieplex = Charlieplex(pins,NUMBER_OF_PINS);

typedef bool grid[6][5];

int h = 5;
int w = 4;
charliePin leds[6][5] = {
  {{0, 1}, {0, 2}, {0, 3}, {0, 4}},
  {{1, 0}, {1, 2}, {1, 3}, {1, 4}},
  {{2, 0}, {2, 1}, {2, 3}, {2, 4}},
  {{3, 0}, {3, 1}, {3, 2}, {3, 4}},
  {{4, 0}, {4, 1}, {4, 2}, {4, 3}}
};

grid six = {
  {LOW, HIGH, HIGH, HIGH},
  {LOW, LOW, LOW, HIGH},
  {LOW, HIGH, HIGH, HIGH},
  {LOW, HIGH, LOW, HIGH},
  {LOW, HIGH, HIGH, HIGH}
};


grid four = {
  {LOW, HIGH, LOW, HIGH},
  {LOW, HIGH, LOW, HIGH},
  {LOW, HIGH, HIGH, HIGH},
  {LOW, HIGH, LOW, LOW},
  {LOW, HIGH, LOW, LOW}
};

void setup() {

}

void loop() {
  unsigned long t = millis();
  int phase = t % 5;
  
  grid* state;

  if (t % 2000 < 1000) {
    state = &six;
  } else {
    state = &four;
  }

  charlieplex.charlieWrite(leds[phase][0], (*state)[phase][0]);
  charlieplex.charlieWrite(leds[phase][1], (*state)[phase][1]);
  charlieplex.charlieWrite(leds[phase][2], (*state)[phase][2]);
  charlieplex.charlieWrite(leds[phase][3], (*state)[phase][3]);

  delay(1);
  charlieplex.clear();
}

Charlieplex.cpp

/*
||
|| @author Alexander Brevig
|| @version 1.0
||
*/

#include "Charlieplex.h"

Charlieplex::Charlieplex(byte* userPins,byte numberOfUserPins){
  pins = userPins;
	numberOfPins = numberOfUserPins;
	clear();
}

void Charlieplex::charlieWrite(charliePin pin, bool state){
	if(state){
		setVcc(pin.vcc);
		setGnd(pin.gnd);
	}else{
		pinMode(pin.vcc,INPUT);
	}
}

//set a pin HIGH 
void Charlieplex::setVcc(byte pin){
	pinMode( pins[pin] , OUTPUT );
	digitalWrite( pins[pin] , HIGH );
}

//set a pin LOW 
void Charlieplex::setGnd(byte pin){
	pinMode( pins[pin] , OUTPUT );
	digitalWrite( pins[pin] , LOW );
}

//set all as input
void Charlieplex::clear(){
	for (byte i=0; i<numberOfPins; i++){
		pinMode( pins[i] , INPUT);
	}
}