Balloons with photos of memories tied to the bottom is a sentimental and thoughtful proposal idea. Let her pop all of the balloons to find the ring. You can fill the rest of the balloons with sweets, glitter or flowers.
I asked some of my friends if they would still be my friend if I was emo: out of all my friends, my best friend was the only one that said "We would grow apart quickly. STAY WHO YOU ARE NO MATTER WHAT HAPPENS"