I haven't implemented any kind of chore system for my own household yet (my only son is just 16 months), but I can tell you what kind of system I grew up in. I apologize in advance for this being so long--it was a little complicated and will take awhile to explain. For background, I was the middle child of five, with two older brothers and two younger sisters. There is 9.5 years between my oldest brother and youngest sister.
Our chore chart evolved over time--it started out as a wheel, with each of us being in charge of certain things for an entire week (i.e., dishes, taking out the trash, etc.). Then it became more of a list (I remember it being more like this in my pre-teen to teenager years), and the jobs became more detailed (not just do the dishes, but wipe off the counters, sweep the floor, etc.), and we had to check off each job before going to bed. We would be in charge of that particular group of chores for a week, and then we'd switch it up for the next week. We also had big-chore days twice a week, usually Wed and Sat, where we would dust/polish the furniture, vacuum the floors, mop, etc., as well as daily chores that we were always responsible for, like making our own bed.
If we didn't check a job off at night, or we checked it off and we didn't really do it, my dad would put a zero there (he went to work at 5am so he was always up before us anyway). At the end of the week, we'd count up how many zeros we had. When we were getting an allowance, we'd get 10 cents or so knocked off for every three zeros or something like that. When we no longer got an allowance due to hard times for the family, we would lose privileges--three zeros meant no phone for the next week, six zeros meant no phone and no TV, etc. This was before the internet, so I'm sure that would have been a potential lost privilege as well. And we got to choose (with parental approval/veto power) what privileges would be on the list--they had to be something we'd really miss. No sense restricting phone for someone who never uses it or denying going outside to your child who prefers to read in his/her room anyway.
It sounds a little complicated, I know, and maybe a lot more hardcore than you're willing to go (I know my friends always thought it was a harsh system, but for me it was just normal), but I hope it will give you some ideas. I don't know that I'll go that extreme with my own children, but I am grateful for the work ethic that my parents instilled in me, and our house was always relatively clean, which is hard to do with five kids at home. Good luck with whatever you decide to do!