Virginia painter Robert Joyner demonstrates three ways of creating lines in this YouTube video, Acrylic painting tutorial. Brushwork Part 1.
First, he demonstrated using a liner brush, a very long, slender brush beloved by signpainters.
Next, he demonstrates sgraffito – the technique of scratching lines into the paint and letting the paint color underneath show through. He shows how to do this first with a palette knife, and second with the end of the handle of your paint brush.
Joyner's style is very loose and painterly, with thick layers of paint laid on lovingly. It's fun to watch him lay down the paint, and cut back into it to create lines. You can see his work at http://www.robertjoynerartist.com/.
