Hi there, please see my first designs uploaded. Barcelona is known for it's vibrancy and energy, bright colours used in the designs represent this energy. The mosaic effect comes from a very famous artist/architect called Antoni Gaudi, his mosaic work can be found all over Barcelona and is another thing that the city is famous for - so I have used this mosaic effect to form a house shape - when it all comes together into the logo you have a logo that represents Barcelona very well.
Please let me know if you'd like to see any changes.
Second concept that still captures the vibrancy and energy of Barcelona using a handwritten script font with the little hand-drawn house character with a smile.