Ideas for feeding woodpeckers?

Anyone know of anything vegetarian I could put out to feed woodpeckers?

I know, I know: they're insectivores. But there's a gorgeous woodpecker that's hanging out in my backyard, eying the seed and peanuts I put out for the birds and squirrels. I want to encourage him to hang around but I'm not willing to go the suet or beef tallow route.

Ideas? Obviously, I want something stable in our heat/humidity because I don't want to kill the little guy.