Question

Which Blood Vessels should be colored Blue ?The one that take blood to the lungs or those that carry it from the lungs back to the heart

Answer 1

that takes blood to the lungs because the blood it takes is deoxygenated and it is taken back to lungs to make the blood pure but actually they are dark red in colour...
hope this helps...
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Answer 2

The one that take blood to the lungs 
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because they are the ones who carry deoxygented blood to the lungs in order to get oxygenated and they are called pulmonary artery 

but even they are red in colour we do it in order to differentiate