I know this is a very easy work to do but if you don't have time to do it or don't have the knowledge how, this might help you.
I got this idea while reading threads and noticed some of the avatar are not transparent.
Here's what it looks like once finished...This is
Flying Hellfish avatar
___________ | ___________ |
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__Before | __After |
Post you avatar and I will make it transparent
I will only accept 5 entries a day.
Output will be given with dimensions around ~120px wide, ~80px tall, and ~100 KiB in size so you can already use it once you download the image(this is bitcointalk avatar required size)