Nasturtiums are very pretty flowers as you can see by the picture and very easy to grow.
Sweet Peas are also a nice little flower that come in a variety of colors.
Cosmos are also easy to grow and the Red ones are my favorite of this flower.
The Gloriosa Daisy adds a really bright splash of color to any flower bed.
One nice thing about all of these particular flowers, as was said, they are very easy to grow, and require minimum care.