For you to choose what is best for your students:
This open-source unit from Open Up Resources is all about scale drawings. You can choose lessons to supplement Modifying a Board Game.
This link is to the teacher materials and you will find links to the student handouts. You need a teacher account to access the materials.
This well-known game can be modified for the blind. You could use images here to give your students examples of what can be done. (This site has a lot of links, which have not been checked out for child-appropriateness, so use it yourself, rather than give students the link)