From conductive yarn you can make a conductive pompom, just like you would make a regular pompom. You can also mix conductive and regular thread to both save on the conductive yarn and also for aesthetics. Use conductive thread to fasten the pompom together, both because it is more conductive and will make for a better connection to whatever you want to connect it to but also because it is stronger and will not rip.

Wrap thread around two fingers (or more if you want it bigger).

Cut

Make a loop to make a lasso

Thread the other end through a needle, pull tight and stitch it tight

Finished