Iris is such a pretty, underused, feminine name. I, personally, love it, though I may be slightly biased, since it's my mom's name.
Iris Elizabeth - pretty combo, though I prefer the spelling Elisabeth
Iris Amelia - nice combo, but I don't care for Amelia at all
Iris Cecelia - pretty name, though I'd prefer the spelling Cecilia
Iris Amabel - Amabel is dnmsaa
Iris Eloise - don't care for the MN or the flow of the combo
Iris Felicity - combo's okay, but Felicity isn't my style
Iris Gabriella - very nice
Iris Victoria is my favorite "Iris" combo. Some other suggestions:
Iris Caroline
Iris Katherine
Iris Camille
Iris Daniela
Iris Giovanna
Iris Juliet
Iris Julianna
Iris Julianne
Iris Lillian
Iris Monica
Iris Michaela
Iris Madeleine
Iris Nathalie
Iris Olivia
Iris Tatiana