I've got a bunch of network applications written in C# that I want to distribute as open-source. Here is the issue. Since I cannot use any Proprietary/Microsoft graphics, I've used this tango project icons that many other software like LibreOffice, GNOME, etc. However, I've come to know that these are GNU/GPL licensed, whereas I want to release my work under MIT - the least restrictive license, so that maximum people can use my works.
I would like to know from experts, whether I can use these icons/themes in my apps under MIT? Or do I have to change my license to GPL?