a site would be ok for him to start, it does not mean people cant post there art on both sites if they wish.
people who make themes on other platforms like having dedicated place for there work.
theres dedicated theme sites for every platform out there, so one for maemo would be cool.
i've noticed everytime some one posts about starting a site maemo related a few community members here seem to be against it wanting to keep everything possible here,
if we want maemo to spread its wings and go places these other sites are needed
different kinds of people have different kinds of needs so alternatives are good too