What about writing a love letter/poem to your SO in rebus style? Rebus is where you use pictures to replace words or parts of words. You could write a letter/poem and use stickers, hand-drawn pictures, pictures cut out from a magazine, etc to replace some of the words or parts of words within the letter.
Here is a quick example that I made in Microsoft Word just to show you what I mean:
Here is a quick example that I made in Microsoft Word just to show you what I mean:
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