Coins could go well - copper, silver, brass was already suggested but learning something like a muscle pass can draw attention.
Ring and String material can be pretty killer - finger ring magic in general is great and can vary from your ring to their ring and from there ring and string, ring on stick (pen, straw...anything) and can be really awesome when done well.
I do a lot of rubber band magic too - if you don't already there are dozens of effects that can be done with regular rubber bands.
Recommendations? Get something you think you'll enjoy performing. Just browse magic websites that have tons of videos and see what you enjoy. Figure out what you enjoy about cards - is it the performance aspect of magic or the technical aspect - because coins can get technical and satisfy that need, but other forms of magic can be less technical but equally as awesome to perform.