Red is a great colour to add some punch to the garden. It's a strong enough colour to work well in shade.
Some marigolds come in lovely shades of chestnut red with bright yellow centres.
This is an unsual bicolour verbena, but solid rich velvety reds are easy to find at the garden centres.
On another note: The other day, we saw these two horses galloping around their field in spite of the fact that the palomino is due to foal any day now. I can't imagine running around that close to a birth.
The chestnut mare is a bit lazier than the palomino. Here she is eating grass as she rests.