Apart from classical tourist souvenirs, here are some things that are hard to find elsewhere, or even unique.
Kukuxumusu t-shirts, www.kukuxumusu.com. Creative series of good-quality T-shirts which are both funny and on the topic of Spain as seen by tourists. Produces some custom series for regional specifics like San Fermin event.
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Spain: Money and Shopping: Souvenirs is based on work by Denis Yurkin, andres, Eco84, Stefan Ertmann, D. Guillaime, Fegatur, Roundtheworld, Burmesedays, Herga, iGuide, and others. Spain Travel Guide & Spain Interactive Map is available under Creative Commons Attribution-ShareAlike 1.0. See background image credits.