SVG and Postscript, although different, are rather synonymous these days.
Here, Freelance 3D Artist, Dimitris Christou shows how he creates artwork using scalable vector graphics as a base.
Here, Dimitris shows how you can create, import and work with vector artwork in Blender. The process is simple, and it is a great way to start creating geometry quickly and accurately.
Most applications will allow you to read an SVG file. Once you have an imported file, it is simple to start modifying it with 3D operations such as extrude.