Definitely not a "Hi-5" cookie cutter, despite what my daughter thinks.

A simple hand shaped Cookie Cutter

To make a hand cookie, download the STL and print.

Next make a batch of cookie dough, make sure you use a recipie meant for cookie cutters. This site has a really good one: thehungryhousewife.com/2009/10/sugar-cookie-and-icing-tips.html .

Roll thin, cut out the hand.

Bake and eat!

If you want to make your own cookie cutter see http://www.thingiverse.com/thing:32431