This is a very easy project for starters like me, the idea of it is to show you how to send bytes to an 8x8 LED matrix.
I have programmed this with all the letters of the alphabet,if you wish to add something go HERE: http://robojax.com/learn/arduino/8x8LED/
In that link you will be able to make more shapes.
In the left hand part of the page there will be an 8x8 matrix, with all the Leds off, by clicking them they will turn on and at the bottom of the page there will be the code that represents what you are doing to the matrix, when finished change the "sprite name " and paste the code that you just made, in the code that I made.
To make this project work you will need the library:
Which you can download from: