Here's a pretty quick card that's flat and easy to post!
White card is stamped with black Versafine and embossed with clear the treemendous tree from JGS349. Then taking your brayer and the Caribbean Sea Kaleodacolor ink pad, brayer the ink all over the card. Using thin, cheap bleach and a nylon paint brush, add bleach to parts you want white. Here I've painted it onto the circles, made swirls in the heart and draw a frame around the image.
Stamp the greeting around the edge and finish with glitter glue.