Pencil on an index card. This is one of the light switches from my house, viewed from above.

It can be hard to shade with pencil, because pencil strokes inherently have a direction to them. But this also makes pencil excellent for drawing wood grain. There's something very pleasing about a drawing that looks like actual wood.

Approximate readability: 6.00 (263 characters, 57 words, 5 sentences, 4.61 characters per word, 11.40 words per sentence)