While bargain shopping over the holidays I purchased 500 Writing Prompts, a guided journal published by Piccadilly Inc., currently on sale for $4.99 from B&N.com:
This is a really nice, big journal with 240 ruled pages featuring multiple writing prompts that ask some really interesting questions:
To give you an idea of what the prompts are like, here are a few I selected at random from my copy:
Have you ever given up on someone? Why?
Do you have a secret hiding place? What do you hide there?
Create a new nemesis for Batman. What is the character's name? What is their feud about? Describe a short scenario, comic book style.
If you had the power to make something illegal that is currently legal, what would it be? Why?
Name a weird mannerism you have. Do others notice it? Does it help you or bother you?
Aside from great sparks to get you writing more often in a journal, this might also provide inspiration for posts for your blog.