Scratch

Well, I have to make one for a project I'm doing on Scratch day. This project will need to run in turbo-stepping-speed, because it needs to calculate fast.
Anyway, here is my idea....
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Using 2 sprites, one a dot that is one pixel for drawing, and the other an invisible sprite for an engine, I can make real-time graphics. Here is how it works: a list is make for each "sprite", containing x-y coordinates. In the game engine sprite, you duplicate a script and change the list name to the "sprite" list that you want. Then, a variable is set for FPS (frames per second).
The engine also has two more variables: pen-x and pen-y. This is so that the pen sprite knows where to go.
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The pen blocks puts the pen down and does:

when gf clicked
forever
go to x (pen-x) y (pen-y)
end

There are obviously some parts missing, but you could easily (when I'm done) turn this into a 3d engine. Trust me, it will make a whole lot of sense if you do it or I do it.

If you want to try it for yourself, go ahead. I posted it in "project ideas" for a reason!
Ask me for help here.