Blog Images – how much difference do they make?

I am seriously lacking in images to go with my posts, whether it be photos or artwork.  I could hold back on sharing things that I come across but have decided to share them without images and come back later when I have discovered or created the right image.  I haven’t yet found my way around free online images and would prefer anyway to create my own when the opportunity arises.  So I am hoping people will still want to visit my blog and, when it is more colourful, will be interesting to see what difference this makes to my blog stats.  Would welcome comments on your own experience of this.