DropBeacon is a just works solution to use your iPhone or iPad as an iBeacon. You can adjust all iBeacon specific parameters such as the proximity UUID, major and minor ID of the beacon.
In order to use this app, at least an iPhone4S is necessary. Newer ones support BLE as well. The App will not work on an iPhone4, iPhone3GS, iPhone3G or iPod touches. I have not implemented the app as universal app so there is no iPad UI available.
Since the app is not using regular iOS UI components, see the attached Vimeo video tutorial illustrating the usage of the app. I think it is very easy to use.
The app can be downloaded for $0.99 in the Apple App Store using the following link: https://itunes.apple.com/us/app/dropbeacon/id866760594?mt=8