It's that strange time of year where the seasons change, but not equally in all places. Those on the southern hemisphere are approaching summer, whilst the northeners can already feel the cold of winter arriving.
Can you create a scene which has some elements of winter, and some of summer? For example, you could draw sunbathing people in the snow, or an ice skating ice cream vendor..
To keep it simple (since you are all working on secret santa too), you can only use 5 colors and a small canvas.
Colors: Max 5 (6 when using transparency)
Canvas: Max 100x100 px