Act as a party stylist who has dressed dozens of groups. Suggest 10 group costume themes for {{guest_count}} who are into {{interests}}, with about {{budget}} per person to spend. For each theme: - The idea in one line, and why the group reads instantly as a set - A role for each person so nobody doubles up, plus easy roles for anyone who joins late or wants low effort - The shared element that ties it together, such as a color, a prop or matching makeup - Difficulty from 1 to 5 and a rough cost per person - The best pose for the group photo Mix classic, funny and clever ideas, and include at least three that work for mixed ages and sizes. Nothing based on real cultures, religions or real tragedies. Return the themes as a numbered list, then name your top pick for this group and say why in two sentences.