permission is always good. I agree with elvee on that. Especailly if the work is recent. If it is not recent (as in not in the last 3 or 4 months) the at least ry to contact the original aurthors. Some of the ones I want to upload are aurthors from years ago, and I am not sure if they changed their names or just gone.
What makes it safe to do the latter is the all WinStlyes does is combine files that are off the database of WinCustomize through a download. So it is like your still downloading the files sepeatly.
In the end, at least try to contact the original authors. If you can't, then let them know your uploading it and don't use a name that they might use (Like for example WOODY of which would contain everything that is named Woody by treetog)
I'm still waiting for responces, but after a while, like 2 or 3 months, I'll probably put it up giving credit for the original authors.
Oh and remember it is a .SUITE file, not a .XPTHEME file your making. The .SUITE file only contains the links to Wincustomize.