Pixel Art
According to Wikipedia, “Pixel art is a form of digital art, created through the use of software, where images are edited on the pixel level. The aesthetic for this kind of graphics comes from 8-bit and 16-bit computers and video game consoles, in addition to other limited systems such as graphing calculators.” I recommend using Google Sheets with conditional formatting set up with your colors. That is a pretty advanced move so I found an awesome resource that already set this up. Eric Curts from Control Alt Achieve has even offered a link to a spreadsheet ready to go. Thanks Eric!
Here is a video tutorial that will show you all the step and helpful hints needed to create your own pixel art.