Don’t ask why but bedding stresses me out. However once you lose the instinct to make everything match it's not such a hurdle.
Try and stay within a color palette, choose a variety of patterns and textures, and when in doubt, go with your gut. After all, your eyes will be closed most of the time.
And if you're interested in the bedding in the first photo you can find them at Plover Organic.
Images: 1 Plover Organic; 2, 3 Country Living; 4 Bedding Envy; 5 Miss Eclectic