Hardware Secrets posted a guide about customizing the BIOS Boot Logo

Have you noticed that every time you turn PC on there is a green and yellow logo from EPA (Environmental Protection Agency), as shown in Figure 1? Did you know you can alter this logo, and replace it with anything you want in the space where it is displayed? This tip is powerful, if you want to customize your PC. If you’re a service man or if you work in a store, you can use this tip to place your company logo, with your address and phone, transforming this feature in a powerful marketing tool.

Customizing the BIOS Boot Logo