As you review the track feeders on this blog, please keep in mind that not all ideas will work for all horses. First and foremost, be sure what ever you try is safe for your horses and your facility. Some horses might eat the nets, some might want to destroy them etc. Be sure to check that they can't get tangled up or that the design is not hazardous to the horse.
Here's a great resource for other ideas: http://paddockparadise.wetpaint.com/