Spread newspaper on the table and lay the leaves on it.
Paint the leaves with silver glitter-glue. Leave to dry.
Tie the leaves in bunches of 3 or 4, using the silver ribbon. Hang them up to decorate the room.
Try making an autumn wreath for your door by gluing overlapping bunches of glittery leaves onto a styrofoam ring using a hot glue gun. You'll need to use lots of leaves so that the styrofoam doesn't show through. (An adult should use the glue gun.)
What else could you paint with glitter glue? Horse chesnuts? Seeds? Twisted willow twigs?