Pacific Northwest Gardening: New project bed, 1 by NWGordon

NWGordon wrote:
Since everyone was so helpful on the tub, I thught it would be fun to get a little input from all of you on this bed. My last time to hostajim's I put a down payment on an orb, and today I got it! I put some trellises that were laying around up behind and have 30 cannas going in to this bed. Some real tall and others medium sized.
Here's where I could use some help. What to put in the orb? And I should plant something between the trellises, and then some filler plants. It is full sun from morning to night, so bear that in mind. I am going to move some rocks in here also, probably pretty big ones. I'm thinking tropical, but wide open to any suggestions!!