Yard Art has some great modern planters. The are made from iron and you can get them in a natural rust or powder coating. And they will build them custom.

http://www.uniquegardendecor.com

You've also gotta check out Urban Nature.

They sell amazing modern planters and are the best quality I seen to date. Also, they come in hard to find, large sizes and are equally lightweight and durable. Plus they do custom sizes as well!

http://www.urbnat.com

http://www.planterixchange.com

they have some really cool things, as well as a very wide selection.

The best and coolest planters. Hundreds of designs. You will love it. Handmade in The UK. I also know they are looking for agents in other countries.
www.csi.eu.com

Here is a source for modern large square and rectangular planters with drains, trellises, and self watering options that would be good for balconies and rooftop terraces www.deepstreamdesigns.com

@bryan.nyc, International Art Properties sells to the trade only! We carry some of their planters on our website and a wide selection of other modern & contemporary planters.
Check us out at http://www.awesomeplanters.com

Link: www.awesomeplanters.com