i think that's it!! my buds look exactly like the green ones you posted! no color yet & the bushes are tall!! i'm a little concerned b/c they're planted *in front* of much smaller bushes. don't know that the previous owner was thinking...
They're actually beautiful though...and they bloom ALL summer provided you prune them as soon as the buds die. Make sure you post pics! I'd love to see when they bloom!
I agree with MeTheGirlie , it's defnintely butterfly bush (also called budleia...not sure on the spelling). Per it's name, it attracts all sorts of butterflies as well as humming birds. Be careful, it can grow very large if you let it so once the blooms are spent, definitely trim it back.