When I'm a little too tired to meet a decent creative bar, I often go 'cruising for images'. Mostly for content, though, rather than licensed software.

It's good to see the warning, that many free resources are not going to be 'free enough' for inclusion in GPL software.

I have come across arguments or insinuations that the GPL should be 'softened', or that it's criteria ought to be reexamined ... and I must say, this form of activism might at times be behind some offers of "free" materials. Trying to 'pry' the GPL off it's strong stance...

Not everyone likes the GPL ... but an element of self-interest is always hiding in the small-print. Do all the homework; don't grab-and-run.

Incidentally, out-of-copyright old books are fabulous ... but again, investigate the Terms of image-providers assiduously.