I use geraniums on occasion when I am making pots. Usually I use those tall pink ones, instead. It depends on were I am setting up pots, though.
The geraniums that I truly love are the ivy geraniums. They get larger and larger every year and cascade over my rocks. My favorite one is a deep bluish purple, but I have a couple of new ones that are pink, lavender, and magenta. I don't think they will grow quite as big, but they are still pretty. And they are traditionally a hardy perennial on which you can count each year.
This picture shows the blue geranium with my white peony in 2010. I can't wait until they are blooming together!