Vanilla Sugar Cookies
Chocolate Sugar Cookies
I will warn you that while they are "simple," they don't exactly go fast. It takes some real time to do that much writing and tiny details.
Other Links you may want to check out:
Royal Icing Consistency
How to Color Icing (getting red and black is not easy)
And don't forget, if you shop at Amazon.com through my link, you support this blog and its contents. Thank you!