I thought my Nugget wax beans were pretty yellow. You can see a pic on the linked thread. I am not sure if my pics do the color justice but I thought they turned out really yellow, especially after blanching.

Here is a link that might be useful: Nugget Wax Bean Pics

Thanks, John. Those look great. :)

Thanks for the heads up on Brittle Wax. I planted them too. They're just starting to fill out but aren't turning the bright yellow I was expecting.

I find Dragon Tongue to be very colorful...light to pale yellow with purple streaks...makes for easier picking!