this is one of my favourite crafts, I have a giant cardboard ladybug and a spider hanging on my walls and they are probably my favourite part of my room. They are also a great way to use up extra paper or garbage.
you make an 'skeleton' thing and stuff it with whatever you have around (i recommend putting some paper over it) then add paper mache and paint it. relatively simple and it looks really cool when you're done :)
