If you like L. regale you will probably like hybrid trumpet lilies. They are mostly sold as strains such as Golden Splendor, Moonlight, Golden Sceptre and Copper King for the warm color spectrum and Pink Perfection, Summer Palace and Midnight strains for the cooler end. Trumpets are usually out to downfacing and fragrant. There are newer upfacing ones but I don't care that much for them.
A couple of clones are Tropical Isle (B&D) and Copper Crown (LG).
Tropical Isle:
Seed grown white trumpet lily with lots of other pastel highlights:
