Humorous Proposals

Trivial Pursuit
Play a game of trivial pursuit together. When it is your turn to ask a question, casually say "Your question is: Will you marry me?" rather than the question written on the card.

Fortune Cookie
Take your partner to a Chinese restaurant for dinner. At the end of the meal arrange for the waiter to bring over a fortune cookie which you have secretly prepared with your own fortune inside predicting a marriage in the near future. While she's reading it get down on one knee with the ring.

Application for Marriage
Send your partner an application to be their spouse. Write a coverletter explaining why you'd like to apply for the position and how you are qualified. In your resume fill in your employment history with events from your relationship and the skills section with the things you do to make her happy. Hopefully you'll ge the job!

Decoy Ring
Get one of those candy rings or a cheap plastic ring and tell your partner you got something for her. Present the ring to her and ask her to close her eyes so you can put it on. When you go to put it on her finger switch it for the real engagement ring. She'll certainly be surprise when she opens her eyes!

Spell it out
Get some alphabet soup or cereal and pick all the letters out so that the only ones in there are the letters that are part of the sentance "marry me". You may have to use a few packets to get enough. Hopefully she'll notice that there are only 5 different letters in her alphabet and get the hint.