This is a tri-folding card you can make from an 8.5 x 11 sheet of cardstock. On the innermost panel you might want to glue a contrasting piece of paper.
See the attached image for instructions on which layers to mark as engrave, score, or cut. I found 75 LPI engraving sufficient if you don’t mind (or even enjoy) the horizonal lines texture. Otherwise if you’re willing to wait an extra 10 minutes or so, go for 125 LPI.
Download tri-fold card.svg