I don't dislike it, but I really think it's rather boring and bland indeed.
Ray is a cute nickname, but I totally don't see it as a nickname for
Rebecca. I kind of like Rea but am not in love with it either. I know a lot of very cool Rebeccas, Beccas and Beckies but I just don't like either of this version particularly much. It's a typical mummy name to me, although it may be just my association and not have much to do with the actual periods of this name's popularity anywhere.
Rebecca Elise and
Rebecca Louise are nicely flowing combos, plus I like
Elise and
Louise on their own, but as middle names, they don't give
Rebecca too much freshness which it would need in my opinion.
As for synaesthetic associations, the only association I have with this name is fish. :D Like the shape and taste of fish.
Emilia Anna, cat mummy to
Misha.
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