If it's anything you would like to see added to the "ocram" picons, you can't do better than the following example:
http://img3.wikia.nocookie.net/__cb2...ies_Disney.svg
If no svg file can be found, a png with correct transparency in a as high as possible resolution is 2nd best. No need to resize it to 400x240 or whatever and middle align it, because the script takes care of all that and in a few years we've got 4K receivers with retina front LCD's and the resolution of 400x240 will be worthless, just like all the other picon sets that use these fixed resolutions. I/we however will add a couple of lines to the script and release 1500x1500 picons.
Sadly I had to learn all this the hard way a few years back, when 100x60 was considered
, I was not pleased when somebody released XPicons and I realized how stupid I have been by resizing everything to 200x120(I even doubled it, but still severely lacking).