I'm adding some graphics to a Word document and I'm playing around with borders. It seems I can create a visible border around images that are wrapped within text but not if they're alone on a line (i.e. surrounded by white space). To do this, I right-click on the image, go to format picture, click on colors and lines, and under line I set color to black. This works on images within text. With other images, however, the option to set the line color to black is grayed out.

Is there any way around this?