WPF - How can I make a brush that paints graph-paper-like squares?

Question

How might I create a brush that paints a regular, repeated grid of 1-unit thick lines spaced evenly in both the horizontal and vertical axes? Imagine graph paper, if you wi

Answer 1

I used a 16x16 bitmap with the left and bottom edges black. Then in my window, I set the background to use that, tiled. Here's the XAML (Slightly altered to show up).