I have chosen to use what I think of as true monochrome: black & white/grey-scale.
First I made a black square card, then folded the front back on itself to create a more interesting shape. Then I cut some patterned paper to fit the back section and glued into place.
I printed a fairy digi-stamp (free download via Simply Cards & Papercraft), plus a sentiment and different-sized stars onto white card. I cut the stars out using a craft knife so I could use them as stencils.
I coloured the fairy with watercolour pencils and water then allowed to dry. Once dry, I decorated with black and white glitter to add detail and glued to the front panel of the card, overlapping slightly. I then glued the sentiment to the bottom right corner of the back panel.
Using the stencils, I placed stars and first drew with pencil so I could re-position if necessary. I then drew over the lines with white pen. I filled the stars on the back panel with PVA glue then covered with white glitter. Once dry this went a bit see-through and didn't stand out that well, so I outlined with black pen.