The topic should be seen in the broader sense, so it could be something typical related to birthdays like cake, balloons, candles, piñatas, etc. or the actual day of birth like pacifiers, storks, baby animals, etc.
and yes, it's my birthday this month
Here are two of my old designs that would qualify:
- one or several uncut sheet(s) of paper, the paper shape needs to be convex (so e.g., square, rectangle, triangle, hexagon)
- MC or similar is allowed for shaping
- the model needs to be designed (or significantly re-designed) in May 2019
- if the connection to "Birthday" is not obvious, please add a little explanation