Can a good idea be patented?

Patent protection is a technical means, and you can't apply for a patent just for creativity. For example, what you said above is the transformation of old things, so it is necessary to write how the transformation is carried out and what technical effects will be produced after the transformation. What needs to be clear is that those skilled in this field can understand it after reading your instructions. Of course, if you apply for a patent, even if others know how to realize it, you need your consent to implement it.