Plugin for common color maps?


Hey there,

Thanks for a great library - I've just been getting into it via the rio-tiler library where I'm building an app for showing imagery in combination with stream gauge data (see below).

What I'd like to do is apply a suitable colormap to my tile to match the Water Index that I'm displaying which I'm sure this is doable with rasterio (he says without having tried it).

Would it make sense to perhaps package this sort of thing as a rio plugin, eg a plugin containing standard color ramps for commonly used indices? 

Have I missed anything existing anywhere and would this make sense and be useful?