Which one I'd use would depend on the sentence and the context, which you haven't given. Therefore, I can't put a high confidence level.

I associate frieze more with architecture (bias relief).
Indoors, technically, a frieze is a decorative panel at the top of a wall. As I understand it, the ceramic tiles can be used to make a band of decoration anywhere on the wall or floor.

So, I'd tend toward border, not frieze.

The site you indicated
http://www.ceramicaferres.com/eng/index-girona.html
has many simple errors in English (... are make by hand; frizes, etc.), so I wouldn't look to it for answers.

frieze1 /friz/ [freez] –noun 1. Architecture. a. the part of a classical entablature between the architrave and the cornice, usually decorated with sculpture in low relief.
b. any decorative band on an outside wall, broader than a stringcourse and bearing lettering, sculpture, etc.

2. any decorative band at the top or beneath the cornice of an interior wall, a piece of furniture, etc.
http://dictionary.reference.com/browse/frieze

cenefa = (arquit) border
http://dictionary.reverso.net/english-spanish/cenefa



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Note added at 2 hrs (2007-07-24 10:10:44 GMT)
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OK, if it's in a list, I'd go with
Decorative/ornamental border tiles