A great alternative to numerical clocks is this worded clock by Biegert & Funk.
Called QlockTwo, this clock tells the time using words highlighted by LEDs. It is available in numerous colours and languages.
I like how the smooth design and structured typographic grid compliment the illuminated words and make it stand out.
You can purchase the QlockTwo in various colours and languages via Biegert & Funk's online store.
And there's also an iPhone application available!