If you're stuck for ideas, bored with writing in general or just want to have fun I can recommend going to one of Wendy Greenhalgh's Story Scavenger Workshops.
It's a bit like a treasure hunt, but instead of just collecting impressions/people/objects you write about your finds after. Exercises involved spying on people at Brighton Station, picking an odd object in Snooper's Paradise, and photographing as many blue things you could find in fifteen minutes, hence the blue guitar in the above photo ...
I came home with my head filled with North Laine impressions and a notebook full of half-finished stories and ideas (to hopefully be developed into finished pieces at some point). Even though I was knackered when I came home, I still felt inspired to sit down and write some more in the evening - the playful workshop really opened up my writing energy.
Check out Wendy's blog , for the latest news on story scavenging and other similar workshops.