Theme maker doesn't make source packages I think you might be able to upload them as non-free packages. I just tear apart my deb an rebuild it as a source package. Just so everyone knows also I'm not a programmer I'm just a theme designer for the first year I did themes I couldn't package them my self, I know have a simple script I use to build my source debs on the tablet then upload to extras using web site. The amount of time it takes to design an make a theme is much greater then the time it takes to build the proper package.