I think it's strange and a little creepy, but that my be because my own sister has a "friend" who's basically been trying to "single white female" her entire life, only everything about a year later.
When my DS got her first job in a very small boutique, this girl went and got a job there as well. When my sister moved out of the small village where we all grew up and into a big city, this girl followed, and even moved into the same block of flats. When my sister chose her university, specifically for a strong and streamlined professional programme, this girl chose the same uni, but for no "real" reason. That's all fine, she wanted to be near her friend. But it gets weirder.
When my sister started getting really serious with her now-DH, this girl decided she needed a (her first) serious boyfriend. She latched onto the first man who would have her. When my sister got engaged, this girl started pressuring her boyfriend into marriage.
She also insisted on the exact same engagement ring that my sister ended up getting, which is bizarre because this girl is generally NOT a materialistic person, but she threw an absolute shitfit with her DP over the ring. My sister's DH was very lucky to be fairly high earning for his age at the time, so her ring was more expensive than this girl's DP could afford. Yet this mild-mannered and not at all materialistic girl actually nearly called off the engagement over the ring, because it had to be the exact same ring as my DS has.
Then she insisted on the exact same wedding - same colours, nearly identical dress(!!), same venue, same time of year (a year later), everything. The only reason she didn't get the identical dress is because it was already discontinued when my sister bought hers, and it was a miracle that she was ever able to find it. And the venue issue is ridiculous because, without getting into details, the venue is VERY obscure but holds an intense personal connection for my sister and me, and really only us.
And of course we saw at the wedding - the exact same wedding we'd just been to a year previously - that the wedding bands were identical to my DS's as well. It was only at that point, IIRC, that this girl's DP realised that she was copying my DS, as that was the first time he'd seen my BIL's identical wedding band.
Then, when my sister had her children, precious and dearly wanted children that she'd planned and even saved money for her entire life... guess who got pregnant immediately after? Without ever really having thought about having children before? And she didn't even have any shame about telling my sister outright that the only reason she wanted to get pregnant was because my sister had kids! She is actually a pretty rotten mum and doesn't even enjoy her poor kids, leaves her long suffering DH to handle basically everything, and still admits that the only reason she had them - two of them - was that my sister had two DC. She only really interacts with them to post milestone pics on facebook that are startlingly similar to ones that my DS has posted.
Anyway. So, yes, I find it strange when somebody wants to copy your wedding. I don't like it in general, either, though I suppose that may just be me being petty? Sure, it could be because the person copying yours simply thought your wedding was lovely and it's a complimentary gesture more than anything, but I still wouldn't like it, myself.
I think a person's wedding day is a very special, and very personal, thing, something into which we've put months and months of effort - and many of us, years and years of thought and mental planning! - in order to make it uniquely our own! I would be pretty annoyed if somebody just took all of my ideas for themselves.
But, then again, as PP have said, I don't know what you could do or say about it without coming across as strange. =\