Euphoria backgrounds – there are ultra high quality warm, clean, smoothed backgrounds. They will be nice choice for the twitter, website, flyer, as wallpapers, etc. 6 jpg backgrounds, 2560×1600 res, 300 dpi.
To change color just drop one from .Jpg files, click on the layer, click Ctrl+B and play with it! Also you can use Curves, Photo filter, hue\saturatin, etc. After this operations I recommend you to make Gaussian Blur ( ~20-30) for more clean look. (If you have more than 1 layer merge them all and after this operation use blur).