Anyone had luck offering digital downloads as the main product?

[JDWFoto]

I'm interested in offering background designs as digital downloads but it seems like they have to be added to cards or some other print product first. A few questions:

What would be the best product to add to for a digital download first listing?

Is there a way to only display a design as a digital download?

Is there a way to offer design bundles as digital downloads?

Thanks!

[CreativeLeahG]

I am also interested in this but currently the price for download of a single design would not be competitive with the rest of the market outside of Zazzle who as you mention offer as 'bundles'.

[ThankYouAlways]

This sounds very interesting offering design bundles. I wonder if Zazzle would consider offering this in the near future?