The origins of your minature horses would be a great starting point...
Have a good time. If you can, post up some pics of the horses :)
Oh they are cute! I'll see about posting some pics. I just started looking into their ancestory. Here's a little info.
History and Origin of the Breed
The first true Miniature Horses originated in Europe. As early as the sixteen hundreds, these tiny equines were being bred as pets for the European nobility. Paintings and articles were featuring the Miniature Horse by 1765. Lady Estella Hope and her sisters carried on the original English lines into the mid-nineteen hundreds. Many of the smallest Miniatures in the United States are from the Hope line. Unfortunately, not all early Miniatures were pampered pets of kings and queens. Some were used to work in the English Midlands and Northern European coal mines
An interesting new application for these little, mutant horses is training them as seeing eye horses. They are as intelligent as canines, possibly even more so, they live as much as thirty years, see in color, and have a 300 degree field of vision.