Did you see my script released last week? Are you using other software than PSP so you cannot use it? You are in luck as I now offer a total of 64 buttons in greyscale for you. Sixty-four buttons, that is what can be done with the script. You can colorise them as you want. Do you ever have enough buttons? With all these, no more worry about finding yet a different button for the job. FOUR shapes, EIGHT designs, two or four holes. So ALL the buttons are different.
Get them here.