If you use Adobe Illustrator you probably know about custom brushes. Here is a set I use to create soft shadow effects in vector art. "Colorization Method" is set to "Tint" so you can set the stroke color to whatever you'd like.
After downloading the file, go to the Brushes panel flyout menu and select "Open Brush Library>Other Library".
I live and work in Moberly, MO with my wife Marilyn. Together, we're loving the journey called life. We have four children who bring us great joy. We also have two dogs that keep us entertained.