I have a beautiful, container-grown Ixora x 'Maui', also known as 'Maui Red' blooming right now on my front porch. It is the same or very similar to the seventh shot in the original post. More people should try Ixora, in the Madder Family (Rubiaceae).
Are they tender? Yes, but I find mine no more tender than many other sub-tropicals. If anything, it seems a tad hardier than my Hibiscus rosa-sinensis, and many people attempt to grow those in temperate climates. if you are in USDA Zones 9 or 10, just site it out of the worst of the winter wet and frost. A porch or overhang should do fine. A large container is ideal so you can re-situate it each Spring and Fall. For USDA Zones 8 and lower it should be somehow wintered behind glass.