Card making: This I LOVE U card would be great for Valentine& Day or just to tell someone you care. Print the template and cut the solid lines with a sharp knife. Don& cut the dotted lines. Those are there to show you where to fold.
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.