In my mind, Faber-Castell will forever be the ultimate pencil. I think yellow pencils are a staple of American culture but in my mind pencils are green... http://www.fabercastell.com/products/pencils/GraphitepencilC...
I suppose it's quite easy to monopolise the visual imagination of one child. I picture pencils as black, because someone once gave me a nice mixed tin of Caran d'Ache pencils which were all matte black, and I used them endlessly to do drawings of 16x16 sprites and 8x8 fonts on graph paper.
Totally off-topic but I just realized as I read that that it sounded like the Russian word for pencil: карандаш (karandash)
So I thought, aha, it's like with Xerox -- the Russians took the name of the company that makes the item and named all the items of that type after the company's name.
But it actually is even more interesting. The name of the company was taken from a French satirist who created his pseudonym after the Russian name for pencil.
And then, later, a Swiss company that made pencils used the name of the French satirist's pseudonym as their name.