In any case most actors are shot in front of blue screens and the backgrounds, animals, buildings and SXF are added digitally, so why not have a go at it. When you've made a model, what will survive in 10 years? The memory, a few photos... hang on, in the end the memory fades and the photos are what keep that paths open, so fantasize a bit and put yourself in the picture with this instructable, it's easier than you think.
Also why not put you own models in film settings. You'd be surprised how fantastic things look when put in the right setting, and you don;'t have to be a Hollywood model maker to make them look fantastic. At the end of this instructable I've posted an image of a paper rocket, looking ... well, you be the judge and tell me what you think.
For me there is nothing like Adobe Photoshop, now if you haven't got it or have never used a photo manipulation package before, this instructable is not a substitute for learning how to use it. What I hope to do is fire your imagination and show you a few tricks to help your composite retouches look better.
In this instructable I am going to show you how I dropped myself into a poster for the most recent Harry Potter film, wearing a Mad Eye I made from some junk (see another instructable about how to make that).
The picture you see here is a crop of the full image.