High quality free pictures and images

When publishing an image can really enhance the web page and post – this is when searching for good quality images begins.
To make the process quick – I go to http://pixabay.com/
It is a nice site with creative commons images.
I like to pull images from that site, I usually save a copy of the source url for my reference and tweak the image slightly – mostly just crop using the GIMP and that’s it.
This image for example is from http://pixabay.com/en/colored-pencils-colour-pencils-star-179170