These two just came out of the fridge yesterday:-

N. lowii x campanulata

N. truncata x spectabilis
This one was out of the fridge since last September. The colour shows no signs of fading yet! (some of the bleached colour happened during the dry freezing process)

N. x Dyeriana
All in all, dry freezing is quite an easy process. You'll just need a scissor, patience and the heart to cut the pitchers

I dry freeze my pitchers for 6 months.