I did this a couple of years ago. A collage of the view outside the art group meeting hall. I did a small sketch and then drew out the tree on the back of wrapping paper. I built up layers of paper and glued them one on top of the other, starting with the background trees in a pale purple and two individual trees on top of that. I then did the chain link fence out of silver holographic paper. Finally I cut the tree out of a darker patterned Christmas paper. The blue peices of paper on either side are meant to represent curtains.
I think making things like collage is quite creative. My example is very simple but you can go into much more detail. All you need is a pencil, paper and a pair of scissors. Maybe something to do on a wet weekend?