DIY Spell making

[Hagrid]

No: HPFGUIDX 141218

How do wizards and witches make a new spell? 

I was of the opinion spells were something supernatural that existed 
in nature and just needed to be DISCOVERED and tapped into.

Now I am thinking a devious mind can come up with a new creative (or 
destructive) spell like a hacker comes up with new viruses or trojans.

Or are spells more like coming up with recipes ... a pinch of that 
spell, a touch of that and .. ooh, what happens if I bring this in.

Do It Yourself (DIY) Spells ... I wonder who will show a flare for it 
in the trio. - Or have the twins been doing it all along?
-aussie-