If you’re making your own PCB with the toner transfer method, you might find that getting nice clean ground planes is difficult. John on twitter (@johngineer) realized a simple, but effective method.
Use a hatch pattern for your planes and then fill in the squares with a Sharpie. Simple, but effective. The paper detaches easier and the etch comes out cleaner.
For help on creating ground planes in EAGLE, check out this video tutorial I put together.
