Personally I think it's fallen out of fashion. For my blog I'd either use a meme or other dump picture for each post. When generated images first came out I used a few for blog posts, it was new and interesting and said "I'm interested in technology and like playing around with new things".

Nowadays I'm back on the meme pics. I feel now it's so much easier to generate images, it more says "I want to look professional but also spend no money and have no standards".