Some one doesn't know that on LorenzGames.com there is a
Thumbnail Icon Generator.
It can became a very useful tool if you want to create rapidly icons for your game in any possible size.
Choose
the sizes you want, then you have 2 rectangular marker on the screen,
the gray one is to localize the portion of image you want to use, the
red one is used to manage rectangular icons about what portion you want
to use, if top, center or down.
The option "Scale Mode" is used to create similar scaled icon resizing the big one.
As you can see in this image, I used a Scale Mode icon generation and the red marked is moved on the top.

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