A great source of inspiration...
I think Mother Nature is the most fantastic artist!
Turning to nature is a great way to gain inspiration for color combinations, shapes, textures, patterns, etc...not to mention the actual raw materials that you can incorporate into your creations.
I think there are no mistakes in art...as in nature.
The next time you feel blocked creatively, maybe looking at a beautiful landscape, a colorful flower or a sparkly stone will help you get past it effortlessly.