You can just stick a trellis in the pot - that's what I've done. Home Depot has a good selection, as does Amazon.com. I even have a 4' wide arch in pots.

Pics from last year (click to enlarge):

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Great pictures. Your clematis look lovely. When I got home yesterday afternoon, mine were waiting for me on the porch. They came from 'Silver Star Vinery.' The rootballs look were healthy.

Thank you for your input.

I went to the closest Home Depot that I could find but did not find what I was looking for. On the way back, I stopped at Wal*Mart where I found two nice and affordable container (20"x20") as well as two 5' trellis (they kind of look the same as the one in your first two pictures).

Great! You should be fine. Be sure to post pics once they get going, I love seeing everyone else's clems!