I designed this to look like someone scribbled a face on a snow-person using a marker. I drew the SVG by hand, imported it to OpenSCAD, and added the fixation posts to the back at a slight angle so they help the pieces stay in place when the snow starts to melt. I went through a few iterations for the post design, but the uploaded version works pretty well.

When I sliced, I scaled up the whole print by 160% (all axes) and that gave a pretty good size. It should scale up or down depending on your creation size.

I printed in PETG to be more UV/sun resistant over time. I also printed at 0.3mm for a little more strength. Depending on how cold it gets, they can get brittle.