Re your study visit to the British museum (which I missed unfortunately), I hope you were all interested in Arabic script. I think Arabic is one of the most beautiful languages to write, and not just because it's my native language :) Arabic script is both so complicated and so rich that it is a fertile ground for creativity. As a standard, there are 5 main types of Arabic script, illustrated in the photo below. In Egypt, we used to learn in school the first one, naskh, and the last one, riq'a (of course, my own handwriting is not that good, but I generally write in riq'a).
But when it comes to the art of calligraphy, the options are endless. I think you've seen some examples in the British museum. You might also be interested to have a look at these examples of contemporary Arabic calligraphy designs.
Finally, here's another photo I like. This guy, apprently in love and with good artistic skills, wrote on the car "love from first sight", with diacritics and everything (he even managed to include a cute heart shape connected to the word "love":) )
Mai