Try a theme party. Theme parties are fun for kids, and adults can get surprisingly excited about them, too. Try a Paris party with crepes, French pop music and a giant cardboard Eiffel Tower for photo ops.
Our office decorated for Party Day theme of Paris! Mural hand painted by my colleagues. The Eiffel Tower constructed from cardboard boxes, paint and black tape. Hedges are boxes covered in painted crumpled paper. Lamp posts made from poster tubes.