border – Draw a black border around a Plain TeX page
The border is drawn (as it were) “on top” of the page; since the border doesn't honour the \hoffset/\voffset positioning of the text, this is less of a problem than it might be.
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page trim marks and decorations
Maybe you are interested in the following packages as well.
- placeins-plain: Insertions that keep their place
- cropmark-pu: Cropmark macros for Plain TeX
- evautofl: Pages with cut lines and punch marks
- firstline: Print the first line of a paragraph in a different font