you can totally use printed things from your inkjet printer or what not. Just be careful.. so use too much decoupage glue.. then it will run. I made a scrapbook for my BF for Valentine's Day.. I decoupaged the whole thing.. it worked really well.
You can decoupage wood, but as said above.. using a stained, or pre-treated wood will probably work better.
I love decouaging.. SO MUCH FUN!
