I like them, they have more character than the balsamiq mockup icons. I'll probably use them for a notebook site I'm building. If selling some of these icon s

I like them, they have more character than the balsamiq mockup icons. I'll probably use them for a notebook site I'm building. If selling some of these icon sets covers your costs and allows you to keep doing it, then that's great! Plenty of people will get to benefit from any free sets that you do (like the Christmas ones!) Also, paid icons will add a little something extra, instead of being ubiquitous like the freely downloaded icon sets, they'll add a little more charm & creativity to a project.