I know it’s a bit early but this will give you a chance to get the materials you require.
Spooky Silhouettes
Art teacher in LA
Mythical creatures (made from clay/ could be a drawing lesson too!)
Monster Attack
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.
Halloween silhouettes
We made these last year. Tutorial here.
Halloween monsters (using bottles)
Spider webs
Lots of ideas above – hope you like them! Niamh