It could be an easy one but I would recommend some basic knowledge.

Step 1: Find a Foam

Find a form to be your base ready for felting. It has 2 parts, one is the front part which cut through the foam. The second one is just for the back side of the BMO.

Step 2: Test Your Matrix LEDs 8 by 8

Then, try to test your Matrix 8 by 8 on your breadboard first.

5v/3v -> VCC (Number 8)

GND -> GND (Number 4)

PB0 -> DIN

PB1 -> CS

PB2 -> CLK

Thanks to this website for the ATtiny Diagram https://wiki.modellbahn-anlage.de/ATtiny13

#include <LedControl.h>
int DIN = 1;
int CS =  2;
int CLK = 3;
int pin = 4;
bool isTouch;
long previousMillis = 0;
long interval = 500;
int Step = 0;
int Face = 0;
LedControl lc = LedControl(DIN, CLK, CS, 0);
void setup() {
  lc.shutdown(0, false);      //The MAX72XX is in power-saving mode on startup
  //  lc.setIntensity(0, 15);     // Set the brightness to maximum value
  lc.clearDisplay(0);         // and clear the display
  pinMode(pin, INPUT_PULLUP);
}
void loop() {
  unsigned long currentMillis = millis();
  //TOUCH
  if (digitalRead(pin) == 0)
  {
    //    isTouch = !isTouch;
    Face++;
    delay(500);
  }
  if (currentMillis - previousMillis > interval)
  {
    // save the last time you blinked the LED
    previousMillis = currentMillis;
    Step++;
  }
  if (Step > 2)
  {
    Step = 0;
  }
  if (Face > 2) Face = 0;
  byte Blank[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
  byte Sleep0[8] = {0x00, 0x00, 0x00, 0xE7, 0x00, 0x24, 0x18, 0x00};
  byte Sleep1[8] = {0x00, 0x00, 0x42, 0xA5, 0x00, 0x24, 0x18, 0x00};
  byte Sleep2[8] = {0x00, 0x00, 0x00, 0xE7, 0x00, 0x24, 0x18, 0x00};
  byte Awake0[8] = {0x00, 0x00, 0x00, 0x42, 0x00, 0x3C, 0x00, 0x00};
  byte Awake1[8] = {0x00, 0x00, 0x00, 0x42, 0x00, 0x3C, 0x00, 0x00};
  byte Awake2[8] = {0x00, 0x00, 0x00, 0x42, 0x00, 0x3C, 0x00, 0x00};
  if (Step == 0)
  {
    switch (Face)
    {
      case 0: printByte(Blank); break;
      case 1: printByte(Sleep0); break;
      case 2: printByte(Awake0); break;
    }
  }
  if (Step == 1)
  {
    switch (Face)
    {
      case 0: printByte(Blank); break;
      case 1: printByte(Sleep1); break;
      case 2: printByte(Awake1); break;
    }
  }
  if (Step == 2)
  {
    switch (Face)
    {
      case 0: printByte(Blank); break;
      case 1: printByte(Sleep2); break;
      case 2: printByte(Awake2); break;
    }
  }
}
void printByte(byte character [])
{
  int i = 0;
  for (i = 0; i < 8; i++)
  {
    lc.setRow(0, i, character[i]);
  }
}

Step 3: Wiring

I use the conductive thread for this project. It quite weak so please be careful of the thread. I use a needle to put through the foam and tie with the legs around. you can make a bridge in case you need to jump to the other connection.

IMPORTANT

You also need to connect Power (VCC) and Ground (GND) to a coin cell battery in order to get it to work.