I was doing some robot testing at Questacon this morning, and I came across the greatest toy I have ever seen. In the gift shop was a 'Leonardo Da Vinci Action Figure'. It had movable arms and came with a tiny paintbrush and easel. It even had a set of pictures you could slot in and out of the display frame. On the back it had biographical information (Date of birth etc), including a section labeled 'Weapon of Choice'. The answer: 'Awesome Intellect'
Apparently there is also an Albert Einstein Action Figure (With Chalk!) as well, but they may have sold out of that one.