How can I make a wall art design of dancing ladies?

From what era? Does it have to be exact or can it be abstract? The first I would find a scene you like from that era and using an over head projector copy it with a pencil so that you can erase lines but more importantly put your touch on it so you're not stealing someone else's work! If it'sthe second imagine swaying trees or curtains something fluid waving in the breeze but with enough hints to suggest that it's women dancing.

Stencil? I love the idea of a projector!

Check out www.allposters.com for women figures or pinterest. That projector idea sounds just about right.

Projector and pencil. Try triple or more overlap with each a different color

I'd do it with silhouette. Here are two locations with free silhouette art. Not sure how much they can be enlarged but with a projector anything is possible. And color can be changed...kind of like paper dolls; just add a different dress. lol

http://all-silhouettes.com/

https://www.vecteezy.com/free-vector/silhouette