A while ago I found this very interesting article via freshome.com and I thought I would love to share this with you if you haven't seen this yet:
"Garage conversions are very popular nowadays. It is amazing what some can do out of an old rusty room and today we have yet another project that proves impossible is nothing. French architects at Fabre | de Marien managed to completely transform a 41 sqm garage located in Bordeaux into a welcoming living space." (continue to read here)
With some plants and more decoration you could even convert the external part of this wall into a welcoming space that certainly sets oneself apart from the ugly surrounding and might even inspire the neighbourhood to do something similar.