There are a lot of natural things that are the color blue, the sky for instance and there are some that are artificial, like the Blue Man Group, remember them:
But leaves turning blue? If someone had said that they had just seen some trees whose leaves turned blue, I would ask them what they were drinking or were they wearing blue tinted glasses. But the fact is, there are a couple of small tress or bushes beside my driveway that have blue leaves. OK, here are some pictures:
I am thinking that it is a small sweet gum tree, what do you think?
The last picture, I believe, shows the true color the best, or does the first picture show it the best? Actually all three show the true color and the reason that there are some slight differences in color is that they were taken of different small trees. Now, I sure don't want you all to have a blue day, but rather, have a great day, you hear?