The Really Simple Toggle iPhone App I Want

OK, so we went ahead and got iPhone 4s for work. Mostly all good, although a little bit bigger and more fragile than our sturdy Nokia E71s. And the whole millions of apps things is sort of handy. However, there is 1 app I really want and just can't find. Actually, make that 2. I want an app that is simply a toggle button. All it does is switches tethering on and off. And another one for Bluetooth. In other words, want to be able to touch on an icon on the home screen and Bluetooth switches on, touch again and its off. Better yet if the icon can indicate whether it's on or off. Come on someone, write this already. I reckon lots of other people would be willing to pay for this app.