This is great feedback and I'm sorry I took so long to get back to you. I must have missed the notification.
Obvious choices are probably a good thing. I think we all get similar images come to mind when we blog about certain things, so that would likely be what we would look for.
With regards mind, you're right that I should probably have added something more to go with. I was hoping less would get people being more creative. 😉 I read a lot of posts which talk about the mind in regards mental health and psychology, so that's what made me put that topic prompt in.