My bird feeder is in a garden, surrounded by plants. There is some lamium growing under the feeder that hides the seeds pretty well. I also mulch with chopped up leaves, so in the spring, I put a layer of leaves all over the garden which covers up the seeds too.

I've included a link to a picture of my feeder. It's on the left behind the small Japanese maple.

Here is a link that might be useful: Bird feeder picture