If you are not content with a basic tabletop Neon Happy Face, you can customize your own design with snap-together letters in this DIY kit. The sealed 2 x 3-inch blue blocks issue low heat and energy, and can connect up to 22 of them horizontally with a single power source. There are letters, numbers, and characters to choose from and it features a push button for steady or blinking lights. Priced between $3.99 apiece to $29.99 for a set, we could see using it to wish your neighbors a holiday greeting or, for even more prophetic fun in your neighborhood, “The End is Near!”