This is a generalization of the I ♥ X clone begun with the “I ♥ NY” rebus created in 1977 to promote tourism in New York State. Variations on [Place] include any city with enough tourism to want to print t-shirts with their name on it. On the web, I was able to find LA, Boston, SD [for "San Diego" and "South Dakota"], Seattle, New Orleans, DC (for the District of Columbia in the U.S.), etc. This variation requires the styling of the original, where the “I ♥” appears on one line and the “[Place]” appears immediately below it, justified so that the logo is inscribed by a square.
The snowclone is not really limited by this logo styling, however: the X of I ♥ X may be any kind of noun or noun phrase representing something concrete: I ♥ Java or I ♥ my schnauzer is okay, but I ♥ puppycide is not. X must be something that is loveable.
What makes the ♥ version especially interesting is that the phrase “I heart” has come to mean “I love” in English. It’s not completely interchangeable in speech–talking about “hearting” a person is certainly strange, and you can’t say “he hearts his wife”. But ah, semiotics! We can interpret the symbol itself as standing in for the verb “love” or we can interpret the word for the symbol as standing in for the act of love. The actual usage of “heart” for “love” is more playful. When Fran Healy sings “I heart everything about you” in Travis’ song “Big Chair”, he’s being sentimental, but maybe it’s coy: it’s not clear if he means the same thing as if he said “I love everything about you”.
And this leads us to the generalization: we may now get a variety of shapes in place of the heart. For example, I Godzilla Tokyo:
Or I Shamrock Guinness [where I write "Shamrock" to mean the green symbol below, and "Guinness" for the pint symbol]:
The ubiquity of “I ♥ X” is really what makes these other variations possible, and what makes it a snowclone. You can’t understand I Shamrock Guinness without knowing about “I ♥ NY”.
These are the two variations I’ve seen in the wild, but I expect there are others. There just isn’t a good way to do a web search for them. If you have seen one, please point it out to me!
Another addition: fj says, “I know that someone’s done an “I (bean) Chicago” where bean is a sketch or photo of Anish Kappor’s Cloud Gate sculpture, but I’ll be damned if I can find an image of it online.”
Edited to add: Be sure to check out comments here for more great variations!