Everyone has a junk drawer, garbage, broken decorations, etc. Some people have an earring without a match, an old watch, seashells from that beach vacation, old fake flowers, kids small toys (like Lego), a drawer knob and so forth. These can all be used to create your mixed media canvas collage.
You don't even need an actual canvas. A scarp piece of wood, metal, old picture frame, a box, book, anything that you can stick stuff too will work. What you will need to by is some strong glue such as E6000, Mod Podge which you can get at Walmart now, Gesso and some craft paints.
I purchased inexpensive crafts paints at my local craft store. I also made some sprays. How to create your own sprays can be found under the blog tab Craft Supplies, Ideas and Tips or you can just google it and decide which idea you like best.
The people who became my inspiration, their blogs/websites and one of their demonstration videos for two of them:Anna Dabrowski - Finnabair
Leanne of Luvlee Scrappin (video).
Gabrielle Pollacco (video)