Launcher icon pack - round corners?

Hey,

I am currently making a theme. However, I do not like how the apps that are not supported look. The theme is for go launcher. Is there a way to use the iconupon in a way it makes all the apps have rounded-ish corners? To get a more uniform look. Example; the default Go Launcer Theme makes apps a little bit bigger (scale option), but also cuts of the corner to make them round-ish.

Kind regards,
BremFM.