You will have no trouble finding items for sale that contain pictures of big yellow, sunflowers. There are so many, that it may be difficult to find the perfect item as you shop.
This flowers is photographed often because it's so cheery, and is symbol of summertime. It looks like a huge, round happy face, smiling up at the sun. Aside from it's beauty, most sunflowers are also a wonderful food source for birds and squirrels.
The big yellow flower is the one that usually comes to mind, but there is quite a variety of sunflower colors and sizes. The smaller variety is more for show than food supply, and it works nicely as a cut flower.