|I think your idea is hilarious and source images are great. My only suggestions (and this is in response to your forum post) is to work on the blending and shadows a bit to make the objects appear more as if they belong in the scene.
If you are using photoshop, you can create a curves layer adjustment and clip it to the object's layer, that way any adjustments you make to the curves layer only affect the object. Then (for these objects), I would probably darken the layers, then switch to the "blue" channel adjustment and add some blue. You may switch to the "red" channel and add some red also. You can control the brightness of individual channels, and I might suggest playing with those settings until you think it looks good.
Finally, you have to add shadows. Where the objects interact with the scene, there needs to be darker spots where the light acts differently. Objects in real life may have very subtle shadows, but they are there. There are various ways to make these shadows. You can use layer effects such as drop/inner shadow and inner/outer glow, or you can use another empty clipping layer and paint in shadows using a brush. I would suggest making the shadow color an actual color from the background and using a multiply or linear burn blend mode.
Hope this helps!