Any animal charity fund raising ideas...? please!?

I'm trying to raise money for a local (registered) animal rescue charity. I've sold stuff, begged friends and family to the point of losing them :) , bombarded companies with emails asking for donations, all sorts. This is alongside working full time. I've had a few donations here and there but nowhere near enough for the time invested. I know I'm lucky to get anything for the charity but I need more ideas. They do a lot of hard work and there isn't a single paid worker at the sanctuary. Can anyone think of anything unusual? They themselves go out and do the 'tin-shakin' and have odd fund-raising days but they don't raise enough for the work they need to do. Thanks in advance xx