You can go to a website like www.freelancer.com and offer your service for free or a very small price.
Freelancer.com allows you to interact with people who need projects to be done and some of the projects are simple and some are very complex. There is a way to only see projects with the skills that you possess.
If you want to do it for free, what you would do is find a project that you feel that you can do. From there you could bid on that project and set the amount to $0 or if it doesn't allow you to do it for $0 then you could put it as low as it will allow you to.
If you want to really get something quickly then I would look for the ones that are listed as urgent. I've done a couple of those and was surprised to see that a few of them responded to my bid almost immediately.