LoaderPlans.com offer full size CAD drawings of front end loaders to mount on garden tractors. You can build your own loader from these plans at a fraction of the cost of buying equivalent implements. Unless you are lucky enough to own a large name brand tractor you may not be-able to buy a front loader that will fit, so why waste your time when you can just make your own.
They have a gallery of very satisfied customers who have used their plans to build front end loaders and back hoes for their machines. Below is a picture from their site.