This add-on to Zen Cart will allow the store owner to display two attributes in a grid format, by adding that option type under the options name manager. 

This is limited to TWO attributes.  If your product has more than 2 attributes, you cannot use the grid format.  EG:  If you sell t-shirts in several sizes and colors, you can opt to have these selections show up in a grid format, so the customer can order more than one item at a time with different options, right from the product page, as opposed to having to go back to the product page for each different t-shirt they want.

Works with Zen Cart versions:  1.5.3, 1.5.4, 1.5.5

Also works with Stock by Attributes module if installed.