I'm sure there must be a branch of physics called star folding, and if there's not, there should be.
Anyway, OK, OK, I hear you! How to fold stars - I should say that I didn't make these up, but I have made hundreds and hundreds of them. There was a time that I used to carry paper in my bag and leave a couple on the saucer with the tip every time we had a meal out. Now I just stash them in jars (sometimes I add a bit of scented oil for cheap pot pourri) and send them in parcels, and if I can find some Christmassy quilling paper they'll be all over the place then too.
First find your paper:
This has been pretty good stuff, possibly a little bit long. It wants to be about 1cm wide and at least about 25cm long. I started off by cutting my own off pieces of A4 sugar paper which works beautifully.
Carefully tie a knot close to one end, pull it tight and then flatten it to form a pentagon. This is the most important step - if you don't form a good shape here your star will be wonky.
Fold the short end on top of the pentagon - you can tuck it into the knot, but it's going to get wrapped anyway so generally I don't. Note that here I have left an exaggeratedly long end - usually I try to get within a cm or so of the end of the strip. After this picture I tore the end off - naughty!
Now start to wrap - just fold the long end of the paper strip where it emerges from the pentagon, and allow the long end to follow along the edge of your shape. It is easier to see than to describe.
Keep doing this till you get close to the end of the strip. Tuck in the loose end under a handy fold. You may need to fold the end over or trim it first to get it neatly tucked.
You should now have a neat little pentagon:
(who has been drawing on my windowsill?!)
Now, using your thumbnail press hard into each of the edges and voila! Your little star will magically appear.
Denise asked if you could make big versions - I bet you could, but you might need a very long strip of paper (and maybe some glue at the end).
Let me know if you can't follow these instructions. I should warn you that not only are these addictive, you end up with "star folders thumbnail" if you do too many in a session - which is more painful than it sounds!