Geranium
'Ballerina'

A low growing variety with lilac-pink blooms that has dark veins and eyes.  Grows 4-5" high.  Zone 3

Geranium
'Brookside'

Blue flowers with small white eyes.  Blooms a long time.  Grows 20" high. Zone 4

Geranium
'Elke'

Bright pink blooms with white centers and edges. Grows about 10" high
 

Geranium
'Hocus Pocus'

Violet-blue flowers contrast well with the dark purple foliage. Grows 12" tall. Zone 3

Geranium
'Johnson's Blue'

Vivid periwinkle blue flowers from late spring to mid summer.  Grows 15" high, and has a sprawling habit. Zone 4

Geranium
'Laurence Flatman'

A low growing variety, the blooms are pink, with dark purple edges and veins. Grows 4-6" tall. Zone 3

Geranium
'Max Frei'

Low growing plants produce abundant deep magenta blooms sporadically all summer.  Foliage turns an orange hue in the fall. Grows 6-10" tall.

Geranium
'Midnight Reiter'

Light lavender-pink flowers contrast with the dark purple foliage. Grows into a mound about 10" high.

Geranium
'Purple Pillow'

Deep, reddish-purple blooms, with dark purplish-green foliage. Grows 6" tall.

Geranium
'Rozanne'

Perennial Plant of the Year for 2008, this one has large, violet-blue flowers all summer long. Grows about 20" high, and spreads rapidly. Zone 4

Geranium striatum

Light pink flowers with crimson veins. Low growing spreader, only reaching 6-8" in height.

Geranium
'Sweet Heidy'

Showy flowers are bluish purple with a pink center and a white eye. Grows 12" tall.

Geranium
'Tiny Monster'

Abundant carmine-red flowers. Finely cut foliage grows into a mound about 16" tall.  Spreads rapidly. Zone 4.