It's bringing home to me how out of practice I am. One of the first posts suggested starting small - no more than 1200 words a story at the beginning of the month. My immediate reaction was I'd struggle to manage even that in a day. I used to be able to do it in an hour and a half. These days I find it really difficult to go from a standing start.
Not engaging with the prompts is a problem. Show me a picture of a baby elephant trying to rescue a kitten from a river and I'm more likely to think it's twee, and that I hate anthropomorphic animal stories, than wonder how an elephant and cat become best buddies, if they're in league with each other, or what that cat is doing in the river in the first place.
However, even when I was writing from prompts before I was usually supplementing with other prompts. It's when the random connections happen in the brain that the magic starts.
So, for anyone else in need of prompting, here are some of my favourite prompt sites:
Seventh Sanctum, which has prompts for pretty much everything (random creatures, equipment, names) on top of a dedicated writing section that comes up with plots, symbolism, themes etc.
Mangle posts the last 25 images uploaded to Livejournal. Sometimes what you'll get is awful (yes, sometimes that's porn - the site is very NSFW), but sometimes you'll get a gem.
Also for images there's deviantART, which posts up it's most recently popular images on the front page.
The Random Proverb Generator which smooshes up proverbs and serves them back in a new form. Loading it up to get the link just netted me "Absence makes the heart grow words". There might be a story in that.