Neck scarves for doggies would be pretty simple. You could just have them cut out of pretty material or if they wanted to get fancy they could put the organization's logo or name on them. (With iron on transfers or stencils or something).
Um, I guess along the same lines they could always apply their logo or what-have-you to t-shirts and simple (canvas) tote bags. But there might be a little more expense involved in those.
Another thing my local SPCA has done is sells tickets for a handmade quilt. They had a local craft supply store donate material and two of the employees made the quilt (ie, donated their time). I think this might be a bit more of a bigger project then you're looking for, but hopefully the idea might help in some way!