Hourly Chime
If you have installed iFuntastic Support (that is, your phone status is 'Ready 4 iFun!',) then you can enable an hourly chime.
Choose the sound that you wish to play. It should be short (a second or two,) since it is played as many as twelve times, depending on the hour.
You can make this part of a more general theme or make it a theme all by itself. The latter option lets you switch the chime on or off independently.