1. Robin eggs.
2. Periwinkles.
3. Lapis Lazuli.
4. Blueberries. Though if you peel off their skin, their flesh is green.
5. Painter's tape. At least, I haven't seen it in any color other than blue.
6. Horseshoe crab blood. This is because of the copper in hemocyalin, which they use to carry oxygen instead of hemoglobin in their blood.
7. Some fish. What better way to blend into the water than to be a similar color?
8. The sky. That's when it isn't gray, or streaked with reds during a sunset, or blindingly white on a hot summer day.
9. Eyes. Some cats and dogs with blue eyes can have them because of a mutation that is associated with deafness.
10. Socks. Because who doesn't like a nice pair of blue socks?
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