The concept that an image on a two-dimensional picture plane is only a representation of a three-dimensional spatial reality is something that we should be conscious of... especially in a culture that revolves so much around pictures of things. Especially again, for us who develop websites.
That lovely pink background pops so much because it's made up of a rich gradient.
Open this tool, view the website. Grab color swatches from all over the gradient area and you'll actually see a vast variety of colors that make up that "solid" color.
- Mastering Photoshop: Noise, Textures, Gradients and Rounded Rectangles (from Smashing Magazine)
- Download the ColorPic tool