I use a point and shoot camera and was having some trouble getting it to focus on the pen, rather than the black fabric background. I placed a rock in the background of the display, and it solved my focusing dilemma. I can't tell you why or how it did, but it did.
When viewing photos though, I want to see the pen, and CLEARLY. I don't need to see a copy of Beethoven's 5th underneath the pen, and I don't need to see an ugly giant piece of burl which has just been harvested. We are trying to see the PEN, and all the other stuff is mostly a distraction. IF it can be done tastefully, and doesn't detract from the pen, then I don't have an objection. But most people just can't pull it off.