I post work in progress, custom orders and workshop pictures. I also take pics of my boy playing with my beads and making a necklace.
Also, I surf the net about 15 minutes each day and save images in a folder, for later use. They might be funny, inspirational, motivational or cute. Every once in a while, I post one and it gets a lot of attention, more than my posts on my business!
I sometimes post recipes or links to a new blog I've found. Links to a fun product here on Etsy. I just ordered a heat pack and I posted a link.
I read somewhere that the key is balancing all of your posts and that the ratio 80%fun/20%business seems to go a long way..