I think it's nice to send a card with a warm hello, not only on Blue Monday ;-) For my card I used the Simple Flowers stamp set of Altenew. I stamped the flowers with a nice shiny ink (Brilliance ink of Tsukineko). The text is also from Altenew, the Halftone Hello Stamp set.
I'm very curious to see what the CCCB designers made for this challenge, I hope you will also visit the blog (click here)! And of course I hope to see your creation!