Gemini is gifted at collecting and arranging pieces, and has dexterity in the hands. This bodes well for visual arts like mosaics, finger paints, colored inks, and writing arts like calligraphy.
Instruments that make use of the fingers, like flutes and harmonicas keep the mood light. I had a Gemini roommate once that played the accordion. Walking and playing an instrument -- or juggling -- are skills we grow closer to mastering when the Sun is in Gemini.