I know it’s a bit early but this will give you a chance to get the materials you require.
Art teacher in LA
Mythical creatures (made from clay/ could be a drawing lesson too!)
The children chose an image from newspaper/magazine (mainly vehicles but any images could be used). They then used their imagination to create monsters and the scenes around them.
We made these last year. Tutorial here.
Halloween monsters (using bottles)
Lots of ideas above – hope you like them! Niamh