so are you trying to make money while you're working? (I.E. Multishirking) or are you just looking to make some bank during your downtime?
One thing I do for a tiny bit of extra cash (and it is tiny) is online surveys. I do it through pinecone research and get 5 bucks a survey (takes about 20 minutes or less) - the problem is you have to find one of their links to get signed up, they are usually looking for certain demographics - but anyways after you do a survey it goes to your paypal account and its a tiny bit of extra cash
another thing you can do is be a mystery shopper - again about half an hour out of your day and maybe 10-15 bucks
also consider looking in the help wanted section of your local paper, you'd be surprised what you may found - I have a nice summer job (I'm a teacher during the year) that is only 10 hrs a week, I get to be outside, good deal
last one - if you are looking to stay home, data entry can be a possibility, there's a lot of temporary jobs doing it where you can be home and makes some cash
ok I lied, one more - research subject - if you're in Boston and a college student or graduate, the Harvard Business School is always running studies - you usually end up with 20-30 bucks for an hour - good way to get pizza money
hope that helped