Alternate note head shapes

I'm looking for alternate note heads to use. One thing about the note heads the program has is that you can't change the sizes of them. With that said, it makes it hard to use a note head that look pleasing to the user.

The "half diamond head" note head doesn't quite look like a diamond notehead. And the "mi" note head looks somewhat like the one I want, but it's too small.

Can anyone help me with this?