Getting away from the traditional Christmas card how about something whimsical like this little card. This pen and wash or ink and wash could easily be made for a journal page, a bookmark or for a coaster.
Cotman(Winsor and Newton) paints
Signo by uni ball white gel pen
Micron 01 and 03 pens
Arches cold press paper
cardstock from Dollarama
envelope from American Greeting ..Amazon