Large Bells

Sounds simple enough and in all honesty I don't think you'd need much if you do it simple enough. You would be able to construct it by:

Making a 2x2 area
Placing a bell on each of these blocks
Applying two leads to it. One lead makes a large bell lopsided and waiting for the next lead which would complete it.

Alternatively, you could simply place the lead in a spot next to an unmounted bell and adding a second then makes it a large bell.

What's the point? Mostly I think they'd look cool and would give me a lot of things to work with in creative.
If you're looking for a actual use, it could be used to have a larger radius of effect to that of a regular bell.