Have you ever tried to make up a game? It's fun! Though it can take a bit of playing it and tweaking the rules to get a game that has good play balance, the more games you try making, the better you'll get at it.
Break out paper, pencils, crayons, dice, cards, pieces from other games, anything you think might be good ingredients for your creativity. Think about aspects of games you enjoy and work those in. Get your friends and family to help improve it.
I just came up with a game that uses pennies, 6 index cards, and a 12-sided die. It's called 72 Penny Opera. Give it a try and tell me what you think!