I have strong suspicions that most of the suggested hybrids would be very disappointing, if not plain ugly. Remember, few appealing traits come through strongly in hybrids. The only fairly consistent traits are veitchii's peristome, ampullaria's peristome, truncata's size and thorelii's (or what is commonly called that) red colouring. I know there has been much excitement about making hybrids with hamata, but the few hamata hybrids I've seen to date have been real duds.
Also remember that the more complex a hybrid is, generally the more nondescript it will be. Further, crosses between radically different plants can produce hideous results, if you've ever seen the x Tiveyi x aristolochioides hybrid you know what I'm talking about.