Bah. It's trivially easy if your output is simple enough. For plain text, just use blank lines to separate paragraphs, and put the following line at the beginning of your output:

.LP

Then, run your output through the following program: (By default, it will output PostScript in 10-point Times Roman font. Of course, fonts and sizes can also be easily changed.)

groff -ms
[download]

Was that so hard? But wait, there's more...

If you're interested in putting a box around a paragraph:

.B1
paragraph text
.B2
[download]

And in general, lines and boxes are easily created using the pic preprocessor. It's automatically invoked by providing the -p option to groff. A simple example:

.PS
box "boxed text"; arrow; circle "circled text"
.PE
[download]

Don't be afraid.

buckaduck