Pond5 and quickly realized that I can easily do much of what I heard. For pieces in the Pop Rock genre they're mostly instrumental imitations of popular bands/songs, or original compositions influenced by such. In the area of film scoring that was a little more complicated, although I don't think that stuff gets sold as much, so I should probably focus on the areas where I can make some kind of money.
This piece isn't quite as "commercial" as it could be. I had already started it before listening to the above mentioned works, but it could still be in something.