I'm Catholic, DH is Jewish and we had a blended ceremony.
We found a reconstructionist rabbi who performs interfaith weddings, and had the ceremony officiated by both she (the rabbi) and the deacon from my childhood parish. I had to get "special dispensation" from the Catholic church which was just filing a bunch of paperwork, which the deacon took care of because he was excited to do his first interfaith ceremony. For some reason that was never fully explained to us, the Catholic church took the position that although the ceremony did not need to be in the Church, it had to take place indoors. The huppah didn't count, although I really tried to push that one because I would have preferred an outdoor wedding. However, we found "neutral ground" at a beautiful function hall (a renovated georgian mansion) that was ironically owned and operated by the Greek Orthodox Church.
The ceremony took in elements from both religious traditions. My mother was thrilled about the jewish tradition of both sets of parents walking their respective child to the altar. We had the candle rite, the explanation of the huppah, the blessing of the rings, the seven blessings, readings from old and new testament, and the breaking of the glass. It was beautiful, and my DH and I joke about being "doubly" married in two religions, and "triply" if you count the Gr. Orth. hall.