I recently joined a two card swap and the theme was Christmas. I made a background of different hues of blue distress inks and then used some white texture paste on a snowflake stencil. Once that was dry, I used the same stencil and a damp baby wipe to create more subtle snowflakes.
I used a new die of a holly branch stretching across three windows and fixed it to the background layer. Then I just added some little red berries and some sequins and stamped a greeting.