congrats
well of course the tarantula but she has probally seen that cause yigal created it for a video clip so a guy could propose that would be cool.
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second idea
your sitting in a restruant and you float a rose out of a jug (thingo) and into her hands and somhow straped behind it or stuck is the ring so you float it to her and she grabs it feeling the ring then u get on your knees and so forth.
second idea tweeaked
you could have a paper rose and it burts on fire or wateva and it leaves either a ring or a real rose!
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third idea (i dont know if this could work)
you have a skecth pad or the Cartoon Deck but instead of wateva is usally on it pictues of you getting onto your knees and proposing! or it could write the words, "will you marry me" like this
w
wi
wil
will
will y
will yo
ect,
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4th idea
if she wears a necklace you could make it appear on their like on tagged but u would have to plant it their some how.....
or just sneak it onto her finger..
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yer im out of ideas now