[checkout] add color choices to items?

Hi all,

First of all thanks so much for the great work that's been done on Checkout - it is much appreciated!

I have a client who wants to sell floorcloths online and I'd like to use checkout instead of setting up a whole zencart thing for her. There are 5 designs, but each one has three separate color combinations and 7 possible sizes.

Is there a way using Checkout and/or customfields to have 2 picklists on the add to cart page - one with the sizes and another with the colors?

Any help would be very much appreciated!

Running Gallery version = 2.2.3 core 1.2.0.5 and Checkout 0.1.18