well, i myself am a jack of all, and ideating on a bunch of apps since a really long time. I have hosted my ideas java based Chess Program, Perl based cms and retail app, and other enterprise projects on github, but havent got around to getting them off the ground for a variety of reasons.
I have just started with them this year, and hopefully it will pick up steam soon.
So hope that serves as an inspiration for you.
Another thing to keep in mind, apart from hosting your project on github, is 'hosting' the appliaction on the cloud for which you can use wonderful free sites like heroku and openshift, which supports interoperability with github.
There are many such PAAS sites, but openshift is my favourite collaboration site ,because they've got great developer support even for the free account[provided you ask the right questions after doing your research] and supports perl, but heroku also is recommended for hosting python, ruby apps