One of the cooler things to come out of the Brown Line Capacity Expansion Project
has been the design and public art features at many of the stations.
Take the Paulina Brown Line station , located on Lincoln Avenue and Roscoe Street, for example It's embedded art and hanging sculptures remind me of several of the major transit hubs I've passed through in Europe.
The station's windows allow for a bold exterior and bright interior. Europe has some old dingy stations too, but I think for the most part they are more pleasant due to it's emphasis on rail travel (helped by highly taxed fuel).