I was a wee bit shy to say what Stevenson mentioned about the orange and yellow.... Not too clear in my avatar, but my bay Morgan is in a royal purple, and my sorrel QH in hunter green - both shades I think would be radiant on your mare! :)
For those who wanted to see purple I found a pic of her in purple. Yellow is NOT her color, it is most definitely my Morgans color though. And hot pink is out of the question because our trail buddy is hot pink.