Select bright oil pastel colours and cover the entire white paper with different colours.
Idea: Draw the lines of the rainbow to cover the page
Step 2: Option 1: Cover the entire coloured paper with a black oil pastel (Requires several extra black oil pastels). 0r Option 2: Paint the entire coloured paper with black acrylic paint. And wait 10-15 mins for it to dry.
Step 3:
Use a wooden chop stick to draw an image by scratching off the paint from the paper. This will reveal the colourful oil pastels underneath.
Note: Popular Themes: Pokémon or Castles or Trees