re: In search of a spanish spice blend

It was largely paprika, I'm sure. Was it smoky? If so, buy some pimenton (smoked paprika) and start experimenting.

If it wasn't smoky, then look for an unsmoked paprika.
Penzey's sells a blend called Sunny Spain, but it has no paprika (it is made of black pepper, citric acid, lemon peel, garlic, and onion). Epices de Cru (of Montreal) sells an Andalusian blend with smoked paprika, fennel, cumin, coriander, garlic, pepper, oregano, saffron, bay leaf.

And La Boite in NYC has a blend called Catalunya, of smoked cinnamon and paprika.

The bright red color may have been from annatto, but it's more typically Latin American than Spanish. It also has a characteristic slightly tannic/drying in the mouth flavor; hard to describe, but if you had dipped a finger into the dry spices and touched it to your tongue, you'd know if it had annato (achoite) in it for sure.