Yep, we're all different on our requirements, so definitely PM each designer before you use her products on your blog.
I'm fine with using my products on your personal blog as long as credit is placed in your sidebar.
And I'd also appreciate a link so that I can see it in action!
I do require a licensing fee for commercial use (this includes people who design personal blogs for others). Feel free to PM me if you'd like more information on that.