This is just one of the many reasons I am not a big fan of winter... It's not so much the scraping of the windshield I mind (thought that is definitely not my favorite thing to do, either), but the fact that I can't reach the entire windshield without leaning on the car and getting wet and/or dirty.
@grammyn Picnik... in Frames, choose border and one of the choices there is corner radius... that rounds the corners on the mat. When you have that set the way you want and have hit Apply, go to Rounded Edges and move the Corner Radius slider to kind of match up the roundness set in the mat. Click Apply and you are ready to Save and Share.