I am following a plan of my own, blending ideas from many different pro-veg doctors (Mc Dougal/Barnard/Furhman) and eating mostly green leafy and cruciferous veggies, fruit smoothies (berries and citrus), beans and legumes. It is basically a whole-foods, high fiber, low GI, no or minimal added sources of sugar or salt plan. It's a lot more fun than it sounds
I have searched online but the vegetables I eat regularly (kale, broccoli, mixed greens) are barely mentioned even in the lists of low GI foods! The best way for me to check many of the foods I regularly eat is from a list like this:
http://www.*************************...cfoodchart.htm
There are a few books (GI diet books etc.) out that look good too, bit still don't specifically address veg*n low GI' ers!
Good luck and PM me if you'd like!