Here are some ideas for light shade. All are beautiful flowering shrubs. Some of them need mildly acid soil.

• Abelia 'Edward Goucher' - zone 6-9; 5' x 5' at maturity; pink-purple flowers all summer; prefers acid pH soil.
• Abelia grandiflora - zone 6-9; 3 to 6' x 3 to 6' at maturity; pale pink flowers all summer; best in acid pH soil.
• Corylopsis pauciflora - zone 6 -8; 4 to 6' x 4 to 6' at maturity; yellow spring flowers; prefers acid soil
• Hydrangea quercifolia - zone 5-9; 4 to 6' x 4 to 6' at maturity; white flowers changing to deep pink in mid to late summer
• Itea virginica - zone 5-9; 3 to 5' x 3 to 5' at maturity; white fragrant flowers in late spring.

Courtesy of NYBG Plant Information Service