I have a number of small sites each targeting a diferent niche but with very similar structure and most are only a few pages each.

I was thinking of setting up a rails app that would contain all of these small sites in the one app so that I dont have to update and manage each one individually.

Is there a way of changing the style sheet and possibly layout in rails depending on the url so that I could just use one app to serve all the sites?

Can anyone think of any implications of doing this such as seo problems?