$5

Photography website - using gallery & foxycart to sell products

I have a photographer client who I am building a website for. The client does a lot of wedding photography and the likes, and what he would like to be able to do is display the client a gallery of their photographs and allow them to order the ones they like, giving them the option of size, format, etc.

In my head, I thought the best way of doing this would be to somehow intercept the [gallery] output, so that for each image that is returned, I add the product options fields for Foxycart to use.

How would I go about doing this - or is there perhaps a better way of doing this that I haven't thought of?