The motor described here is not useful for much without a lot of extra tweaking and fortifying but it is definitely a cool science project.
first you will need 1 D sized battery then you will need about 3 feet of small single strand wire with enamel coating (not the thick coating on typical wire).you will need 2 paper clips 1 circular magnet about 1 inch (magnet size doesn't have to be exact as long as it is strong enough and has 2 distinct poles.) the last things you will need are tape and needle nose pliers.
first take the 2 paper clips and unfold them then on one end form a cradle by taking the needle nose and twisting one end into a tight circle.do this to both paper clips.
then take the paper clips and tape one to each terminal of the battery with the circles you made in the paper clips going the same direction ( this is where the rotor will sit so position them even).
next take your wire and coil it around the D battery leaving 2 inches on each end sticking out pull the coil off the battery and secure the coil from unraveling by sticking the two ends and wrapping them around the coil on their respective sides.
then straiten the ends of the coil as straight as possible and place one end into one paper clip and one into the other.
if the coil is balanced and paper clips are the same height your are ready to place the magnet under the coil right onto the battery.Then just give the coil a little hand and watch it spin!!