I found this recipe on a low-carb forum when Googling different low-carb websites--it sounds crazy, but the end result is amazing! To quote the original post:
"This makes a wonderful hamburger bun, it tastes like a whole wheat bun. It's very sturdy and holds up well with all the juiciness of a hamburger with all the fixings."
Note: you may need to add more ground flaxseed/flaxseed meal--the consistently of the "stuff" pre-microwaved should be thick and sort of pasty, like brownie batter, not liquidy.