Garden spiders Araneus diadematus are commonly found across Europe and North America. While their appearance is highly variable, they tend to have very good camouflage when viewed from a distance, and have very drab colours. One of the features common across all garden spiders is their pale cross. To us this looks like a single beige colour, but to spider-vision this will actually be seen as two separate colours. The same goes for their prey (such as flies), and their predators (birds and other spiders).
Who knows what might drive this colour, it could be for sexual selection, prey attraction or putting off predators (or a combination of these). Both photographs were taken outside with my full spectrum Canon 7D with a Nikkor EL 80mm lens and a Baader UV/IR cut filter and Baader Venus U-filter.