How can I make a single icon a certain size?

[lamina]

I want to make the hard drive icon on my desktop a certain size. I can resize all icons on the whole desktop, but is there a way to resize just the one icon?

 

[Jessy]

Edit the icon so that its alpha channel is a greater percentage of its total size. It's sort of bad practice, but there isn't any other way of which I know.