Decoupage is a great little hobby. There are so many things you can decorate - I've done a draw set, trinket boxes, wooden spoons, boxes, photo frames, hanging decorations and more. There is also such a wide variety of different papers out there for whatever project you're doing.
My go-to place for decoupage supplies is The Arty Crafty Place they have a wide selection of papers, craft blanks and kits and the prices are very good and as a bonus you're supporting a small business.
Below is a video tutorial on how to decoupage for December's Monthly Make.