I was just browsing some games when I found this amazingly cool and fun flash toy. It's called Imagination.
http://www.neave.com/imagination/
Pretty much it's a thing that follows your mouse and changes colors, but it's a whole lot cooler than it sounds. I made this:

And the flash thing covers most of the screen, unlike what my picture shows, with a right-click option to view full-screen.
Note: this uses a lot of CPU, so close out any programs you aren't using if you have low CPU.
Enjoy.
Edit: By lurking moar on Neave, you'll find some other amazing flash toys.
http://www.neave.com/imagination/
Pretty much it's a thing that follows your mouse and changes colors, but it's a whole lot cooler than it sounds. I made this:

And the flash thing covers most of the screen, unlike what my picture shows, with a right-click option to view full-screen.
Note: this uses a lot of CPU, so close out any programs you aren't using if you have low CPU.
Enjoy.
Edit: By lurking moar on Neave, you'll find some other amazing flash toys.

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