If you want an extravagant spring display nothing can compare to a well pruned purple or white Wisteria. Here at the gardens on Mainau Island in Lake Constance, Germany a generous pergola invites visitors to escape the sun and bask in the heady scent drifting on the lake breeze. What makes this an even more inviting and interesting space is the presence of the chattering water feature and the stylized bird statue. Add a scrumptious lunch to the mix and you'll have delighted each of the five human senses in on small garden spot. http://www.mainau.de/
Supply plenty of comfortable seating for entertaining guests and keep in mind the "line of sight" for situating the seating arrangement. Each seat should have a view that is pleasing.
Wisteria can be invasive if left unattended and, in my opinion, should not be planted to grow on your house. I prefer to use it on pergolas or arbors where if it doesn't get pruned it's not tearing the roof off my porch! Access the link below for a planting and pruning tutorial.
Love yellow? Try Laburnum or Golden Chain Tree. This is the famous Laburnum Arch at Bodnant Gardens in North Wales. The supple tree branches have been trained to an arched frame where the flower clusters hang in abundance from mid May to early June. The variety Laburnum x watereri "Vossii" has clusters up to 20 inches long! http://www.bodnantgarden.co.uk/