There are less places in Spain than in the UK because things take a while to catch on here. I am in Madrid but check these places out in Barcelona! Lovely deco and great cakes and cupcakes in all of them.
http://www.lolitabakery.com/ (website taking a while to load today by the looks of it)
http://www.escriba.es/ is one of the most well known patissiers in Barcelona and either of his shops would be worth a visit I'm sure. His website is fun if you have a great (i.e. speedy) internet connection.
There are more for sure but off the top of my head this is it ;) Have a great time!
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