Shakespeare's Comparison as a Compliment can Lead to some Very Special Treatment

Not long ago I read Shakespeare's Shall I Compare Thee to a Summer's Day? I found the sonnet so beautiful and powerful, it choked me up!  I mean, what a concept.  Take something that's amazingly beautiful in it's own right, describe it in detail, all the while letting a lover know she's even more beautiful than that!

Let's try it, off the cuff: Shall I compare thee to a starry sky?  Your eyes bedazzle as the bejeweled stars, like an ongoing dance, found sparkling evermore above the horizon of your fond smile, even more beautiful than the nocturnal canvass, radiating through my heart in eternal love for you.  

Of course, Prince's song Nothing Compares 2 U, sung beautifully by Siead O'conner, generalizes the technique of comparison to encompass everything, e.g nothing compares to your beauty, your love, your friendship, etc.  Though I love this song, Shakespeare's method of using a specific reference (a summer's day) seems to engage the imagination more than Prince's generalization.

Give it a try if you want to.  Sharing a sensually poignant comparison can lead to some very special treatment!  Besides a summer's day or a starry sky, what works well as a comparison to a woman's beauty?  What might women use to compare how they feel about a boyfriend or husband?