The Wood LED Clock from Pure Modern looks exactly like a block of wood because the buttons and the cord are all on the backside. Because of it's simple design, it can blend into an unfinished wooden bedside table or compliment a clean white room. The numbers glow red so it won't be too obvious in the daytime, but at night it will stand out.
The Open Edition LED Clock is a little bit more noticeable and won't disappear into the background. Made up of four blocks, you can arrange them to fit on any bedside table or confuse people in your guest bedroom by reversing the order of the blocks. While it comes in standard issue red numbers, I personally would go for the more subtle white numbers so when you have to wake up at the crack of dawn, 6:00 doesn't look quite so evil.