I don't know if this is a place where I can also share the things I've tried, or if it is mostly meant for the best pictures only, but here it goes anyway.
Yesterday night I went out to try some longer exposure shots on the highway close to my place. I only have a monopod and it was quite windy, so most shots came out rather shaky. For one of them I forgot to focus, and it came out quite artsy:
Earlier in the week I read an article about inverted lens macro, which seemed not that hard to do. The difficulty is that the Fuji X lenses have software-controlled aperture rings, so rotating the ring when the lens is not attached doesn't actually do anything.
One of the shots looks quite okay: (the backlit keyboard of my phone, inverted 35mm at f1.4):