The Pixel comes with 50 red, yellow, blue, and white tiles as well as 50 white bricks. With these you can customize your keyboard. Before we do that, lets add some feet to this keyboard because we need somewhat of an angle and the keyboard moves around quite a lot without feet. As you can see the feet fit into the bricks pretty easily and with the bricks we can add some height to put the keyboard at more of an angle.
As far as the customization goes here is a that I came up with using the included tiles and bricks.
If you aren’t sure how you want to customize the Pixel, MelGeek actually has an entire design website to help with that. Here you can design both the front and back of your keyboard.
If you want even more inspiration there is a full gallery of premade and user-submitted designs that you can add into the editor. I really like the community aspect of all of this.
Beyond just the tiles that you get with the keyboard you can add your own Lego pieces and sets. You pretty much have ultimate customization here.