Being able to customize share buttons would just in general be an improvement over the current way it works. The current icons are incredibly small and fail to draw the eye.

Being able to change the icon/size of the icon would allow for much more flexibility. I know that bloggers could make good use of this, as well as anyone else who uses social media to share their content and grow their business.

Admin Note:

This is possible to do, but does require a little custom code in the mean time. Here's a Forum article walking through the process of creating customized social share buttons.