Honestly, this technique never occurred to me. But I know I'll use it again. A word of caution: pencils tend to leave shavings behind and can smear (ugh!). I found that a large, fluffy brush was just the thing to keep this from happening.
What I make with my hands comes from my heart. I'll try my hand using any art medium. Paper and fabric are my canvas; ink, paint and fibers my coloring agents. From trash to treasure I'll figure out a way to use it somehow someway someday.