Bloggers are always looking for some great, relevant and free images to spice up their blog posts. Though the images are quite easily available on the Internet but one has to respect the sentiments of photographers. It is recommended blog posts should always employ either the images which are owned by the bloggers or the ones from the Creative Commons stable.
So if one is looking for free creative commons photo, there is a rich repertoire of creative commons images which one can easily find on the web.
Flickr is very popular and quality of images are very good. I invariably use Flickr for most of my image needs. There is a feature in Flickr which lets you search within the creative commons space only. Images are available in a quite a few sizes without affecting the quality of the images. The images are quite good and I am sure your most of the needs can be met if you have the patience to search through the images.
In the advance search option one has to just select the Creative Commons option to find out the images which can be used freely in your blog posts.
Google Image Search.
Images search on Google is another option which can help in finding your images for the blog post. In fact Google images search throws up much better results but the problem is the rights on the images are not very explicitly stated. You may have to visit the site to find out whether the image which you have selected can be used or not.