Following the white garden pictures posted the last days, here a royalty-free stock photo of a magnolia tree with very pure white flowers. High resolution image size is 48.5MB and 3332×5084 pixels in vertical orientation, which should be sufficient for most professional printing needs at 300 dpi.
(Click image for royalty-free license and download details.)
This stock photo is available in five different sizes, in case maximum resolution is not needed.