Recycled materials
It is good to shake it up and use whatever you have available to you as well. This can be fun, low risk, and a good way to explore your creativity and get out of your comfort zone.
Plastic
wrap: mixing and texture (paint watercolor and acrylic). You will get texture that is one of a kind, thin plastic wrap works best like kling wrap and trash bags. I would suggest limiting your colors, so that when they mix, they don’t turn brown. Make sure you leave it to dry.
bottle: texture
bows: to move paint around
cups: circles
bubble wrap:texture
Cardboard
toilet roll: circles, roll paint
thin cereal cardboard: to add to paper and move paint
box: open and rub inner layer
Collage elements and textures
Good to layer, prep pages, add textures and patterns, and collage
wrapping paper
tissue: layer and color
magazines
newspaper
old coffee filters
brown bags
foil: good for collage and texture paint and rubbings
corks: stamps
styrofoam stamp: create shapes and stamp