I have found one of the best techniques is to make a double resolution image in Paint.net (or whatever image editing program you use) then after you have made the skin you can shrink it down to normal size (although double resolution skins still work).
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Please note, I'm not always sane when I post. If I have offended you in any way, I'm sorry, it wasn't my intention.
I've made a few skins, I think this first one is coolest, it even has his mouth-hand things =O
There are these too, which I made out of boredom.
Happy clock guy! png:
Robot clock guy. png:
And this is the one I use for myself!
no png for you