make dog bandanas out of triangles of fabric and let them puffy paint the name of their pet on them.
make a 'cat fishing pole' by providing a stick and some ribbons they can tie to it.
if you want non useful items there are always brown paper bag puppets and styrofoam cup snoopies (which aren't so great environmentally i guess, but you use two styrofoam cups, a little brad thingy that you fold back the two tabs with and felt, you put one cup face down, and one cup on top of it facing out, putting the brad between the cups to hold them together, then glue on ears and faces with the felt (or magic markers)...it looks like snoopy
or you could sponsor an animal at the local shelter by 'adopting it'. go to the shelter and take a photo of the animal (with the shelter's permission of course) and have the kids write nice things about the animal or make a collage that they can hang outside the cages so people take 2nd look. It works better i'm sure if the kids get to meet the animal but that might take too many resources.