Spanish Theme Dinner Party
The suggestions so far sound great. I also quite enjoy picatostes con chocolate and leche frita. The former is bread soaked in milk and fried until crispy and sprinkled with powdered sugar. Serve with thick chocolate (like the kind you would serve with churros). Leche frita is a custard that is refrigerated, cut into squares then dredged in flour and egg and fried then dust with sugar and cinnamon. A little crispness from the frying and inside is creamy custard.
I like your suggestions. Flan is great, but it's so cliched, particularly when there are even better desserts out there like tocino del cielo or yema. Personally I would go for something less soft and try for something like torrijas or the leche frita and picatostes suggested above.
flan or creme caramel - I use the recipe from Julia Childs - The way to cook - it is awesome
sweet rice - if you can't find bomba rice, sushi rice is a good alternative - you are looking for a short grain rice
I was just looking through this site last night:
Arroz con leche (served COLD!).
IMO, the essential ingredients are: short-grained 'bomba' rice, whole milk, cinnamon sticks and powdered cinnamon, sugar and lemon peel.