The most popular method of folding a card is, of course, simply folding your cardstock in half to create either a side or bottom opening card. Although this will probably remain the most popular of folds, there is a plethora of ways to make different shaped cards by simply altering the position and direction of your folds and the size of your card blank.
Next time you're online do a little research into the many different methods of card folding. Search for tri-fold cards, shutter cards, wiper cards, easel cards, triptych cards, pyramid cards, folded star cards, pocket and double pocket cards, envelope cards, origami cards, pop-up and 3D cards, necktie cards... the list is endless! Don't forget the library of card folds we have on this blog too, maybe consider working through the list to find something you haven't tried before.