One of the projects I followed with interest during the Liverpool Biennial last Autumn was Dorrie Halliday's Urban Angels. The full size prints were on the walls of the Quarter Cafe in Falkner St. and during the biennial Dorrie was releasing balloons with postcard size prints of the angels. Her friends filmed the event and you can now see 3 minutes worth on the BBC Video Nation page. Most balloons were released at night so its a bit dark. They angels are still being discovered in all kinds of places, see Dorrie's website for the latest