Images/backgrounds/fonts and much more on http://creativenerds.co.uk/freebies -- royalty free, for use in commercial and non-commercial products.
And a tumblr link with just a *bunch* of writing tools like a phrase frequency counter, a page on world building, one re: finding unusal words, imaginative prompts.... for those who may not have tumblr, here are some of them on that page:
Imagination Prompt Generator
List of unusual words
Orion's Arm - world building and science questions
Word Frequency Counter
Tip of My Tongue - for when you can't quite remember a word