I use photoshop CS6, so basically, if you want a dog with a f*** jetpack, you'll get one... Hopefully.
You can also get transparent background user pictures like mine, the only downside to this is that it only works on Zido because the picture is using the custom grey color your user details are located at
<-------[This is the location I'm talking about]--------
My picture is an example of what I'm talking about.
If you're interested, PM me or make a post and I can see what I can do.
PS: They're free.
PPS: I can also do forum signatures
Also, if you need specifics about this, then just ask.