My rough attempts.
decoration tick
{
orientation="NW";
SetPenWidth(2);
moveto(10,60);
lineto(40,90);
lineto(90,10);
}
decoration cross
{
orientation="NE";
SetPenWidth(2);
moveto(10,10);
lineto(90,90);
moveto(90,10);
lineto(10,90);
}
decoration question
{
orientation="SW";
SetPenWidth(2);
moveto(10,40);
BezierTo(10,20,30,10,50,10);
BezierTo(70,10,90,30,90,40);
BezierTo(90,60,50,70,50,90);
Ellipse(49,95,51,97);
}