I have always used the same brown sugar cookie and royal icing recipes because the feedback is always awesome. Cookies are about the simplest type of bakes compared to chiffon cakes or macarons because they have a bigger margin for error don't need electric mixers. Checkout this post for the detailed recipe for the cookie and icing.
As usual, I made my own templates for cutting out the cookie dough and for decorating the cookies. Please refer to this post on how to make and use the homemade templates.
Cutting out the cookie dough using a homemade template
Icing the cookies!
Although the designs look simple, to ice them perfectly is not as easy as it looks because geometric shapes are less forgiving to errors made in precision. Overall I am satisfied that they look neat enough on the whole :p.