Pixeling

then colour it in =D

add some shading

now make it trasnparent....colour in the background a colour which isnt on your pixel green is an ideal colour.Then save it as a bmp file.

then open up giffy if you dont have it dowload it here....click on load bmp and open up your pixel with the green background. Then tick the two boxes in the bottom corner.You should see a box with a colour in on your image click on your background colour and it should appear in the box you MUST do this. then click save gif and your done you should have a lovly pixel that looks somthing like this...