i made this in class after a test... it is a little thing that will jump across a flat surface with almost no effort (if you think your cool, you can follow the pics, but if you aren't sure, just follow the steps)
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Step 1: Your Paper
your paper should be small it doesn't have to be square but it helps if it is. As stated in the below comments, a notecard, cardstock, or even tickets (like for getting into events, like the "admit one" things) that is the thing i really like about these little things, you can make them anywhere, out of almost anything (as opposed to the frogs [no offense if you like the frog things])
Step 2: First and Second Folds
the next folds are simple, you should fold your paper in half (longways if it is a rectangle) then fold it back out, next fold both edges parallel to the crease in.
Step 3: Almost There
now fold along the crease and do a inside reverse fold (just follow the pictures)
Step 4: Flipping
now simply press down quickly with your finger in the spot dictated by the picture
Step 5: Concluson
happy flippin' ;)