@Karpivna in my family we do this thing with the apple, we’re not looking for the star shape, just everybody gets a piece of it. It supposes to represent unity of the family. We don’t have ornaments of the apple. As far as I know Serbs do not have similar tradition.
In Serbian ladybug is bubamara (Mara beetle, Mara is derived from Marija/Mary). It’s believed that they bring good luck, but no one here is praying because of them nor do people have ornaments of it. I remember as kids we used to wish upon them if they landed on us. When it lands on your hand e.g. you make a wish and then gently blow it of your skin.