Tobias Miller has developed Tube Time ($1.99) which is a clock display exclusively for iPad, and it will surely put the other app to shame. The view is totally realistic. The app was created by the team thaht was brought the LiquiPad HD to you. So, it is understandable that Tube Time has a similar liquidity for its stunning image. You will see the clock in top of a reflective water-like thing and below the night sky. The tube will glow warmly as the time ticks by.
In addition for iPad 2 users, you will be able to have an even better graphics with improved frame rate, as well as the cloud that moves like a nebula. You can display the clock in both landscape and portrait mode, but I think the landscape mode is better as the tubes seem closer to the screen. When the time changes from 12:59 to 1:00, you will see the first tube sinking beautifully.
For me, I think this is the best iPad app that ever been created. The realistic reflective view, water-like surface below, and the flowing clouds above that looks very beautiful and calming the eyes who watch the minutes tick by.