Ok I'll Help you Via
www.planetrenders.net
1. Make Sure your a member of the site.
2. Find a Decent c4d from here
http://planetrenders.net/renders/thumbnails.php?album=1
3. Simply Click on the one you want, and click on the picture again to open it up into render form.
4. Right Click and Save as, and put it in render document or something
Now you've got your C4d saved...
1. Open it Out into photoshop and extract it just how you would extract a normal render
2. Place it on the canvas at a decent place (make sure it blends with the rest of the canvas)
3. Set it to (Linear Dodge/Soft light/Overlay) or just find out what suits it the best.
Remember: You can always change the colour of the c4d using colour settings, and you can always edit the c4d using your rubber ect.