This is how I made myself look like a zombie using Pixlr. This was my first time ever using Pixlr, and I found that it was very intuitive and easy to use.

Materials:
-Computer with a webcam or a picture of yourself already on it.

Note:
This instructable is made to be a guide only. You don't have to follow what I do step for step or in the same order. Feel free to personalize your image and experiment. Please post your picture in the comments!

Step 1: Getting Started

First you are going to want to go to Pixlr (http://pixlr.com/). Select Open Pixlr express (Efficient). If you have a webcam, select webcam. If not select browse and find your saved image. Give the camera your best zombie face and select capture. Then click use image.

Step 2: Making Yourself Green

Go to adjustment. If your picture is fuzzy, select denoise and adjust until it isn't fuzzy anymore. I denoised mine the whole way. Then, still under adjustment, select color. Mess around with the hue until it is a green you like and apply it. You can also adjust the saturation until you find some sickly green you are happy with.

Step 3: Contorting Your Face

I chose to whiten my teeth to add more contrast. Once you are done whitening, select liquify. Push, pull , enlarge, and/or shrink to your hearts content. I changed my eyes and nose. I also cropped my image here.

Step 4: More Adjustments

I darkened my image here so that it would seem spookier. Then I went to color splash. I kept everything grey scale except for my face. I also added the old background in order to make the image scarier.

Step 5: Final Touches

I added the arrrggh! sticker because I thought that its color went nicely with the image. I also added some stain stickers to make me more zombie like. I also added another zombie picture of me. I hope that this guide was easy to follow. Leave any questions or comments below. Don't forget to post your pictures!