Vocabulary is a difficult subject to make engaging for students. Taking the approach of connecting vocabulary with Greek and Roman history makes it more interesting for the kids. We typically introduce the Latin Boxes when we first start discussing the Romans. We also use the Cambridge Latin Course textbooks to do some translation of Latin.
These materials can be easily made on a computer. I made them using Pages. I then printed them out on photo paper, cut them, and then laminated them. Each Latin Box covers a specific subject and contains about 20 vocabulary words.
Latin is also a great way of teaching Spanish vocabulary since Spanish evolved directly from Latin.
English is a Germanic language which imported Latin vocabulary through the Norman Conquest.