title: Creating new shape palettes in ggplot2 and other R graphics
body: <p>I'd like to specify my own shape palettes for <code>ggplot2</code> at least as a vector for input into <code>scale_shape_manual</code>. I really like the paired shapes palette from JMP, but noticed R doesn't have some of these shapes. In particular, sideways triangles (e.g. <code>|&gt;</code> or <code>&lt;|</code>) or a filled upside down triangle (e.g. <code>\/</code>) are missing. Are these available anywhere? If not, how can I specify these extra shapes and is there a way to get <code>ggplot2</code> to use them in plots?</p>