Those decorations came into being as a by-product of icing gingerbreads :). Delicate and lacy. Maybe even too delicate, because two of them died in confrontation with Tosia – our cat :).
This is very easy to make them. Icing should be a little thicker than that to icing gingerbreads. Draw a pattern on a graseproof paper (with black marker or something) and then turn it on the other side – the pattern should be from below because marker can colour the icing. Wring the icing on it and leave until it’s dry.