Here are some (mostly) fun ways to make extra cash:
Make a zine: fold up a bunch of pages, bunch them together like a little booklet and fill it with fun stuff! They can be about anything and include anything. Photos, drawings, interviews, tutorials, funny stuff, poems, little stories, puzzles and articles are always good (or nick bits and pieces from your stack of magazines). Once you've stuck everything down with your glue stick, take the whole thing apart and (at your own risk) get thee to your school/college/work photocopy machine! Print a bunch of copies and flog 'em to your mates.
Babysitting: can be as ridiculously easy as watching telly while the little angels sleep soundly in their beds! If you have awake children to look after, that can also be fun. Get the kids on your side straight away by bringing along little treats for them like sweets or a cool toy to play with while you're there. Only do babysitting if you're really responsible and can keep calm in the face of a screaming snot ball. Also:
Kids Club: Another form of babysitting really but the kids don't know that ;) - entertaining a few kids for a couple of hours at the weekend or during holidays could be fun and you could charge a few quid per kid. The secret to making this easier is planned activities like easy crafts, making pizzas, party games, etc.
Laundry: if you know any really busy people with cash to spare they'll probably be happy to pay you to do a couple of loads of laundry for them. Or just their ironing - do it in front of those trashy T.V shows you were gonna watch anyway!
Baking: those same busy people might want some home cooked meals to stick in their freezers! If you know your way around a cookery book you can offer to bake people's birthday cakes, cookies for the weekend, batches of whatever for xmas parties...whatever you (or they) come up with.
Unwanted stuff: Gather up everything you don't want or write a list. Look at each item and think "Who do I know that could want one of these". It's usually easier and quicker to sell to people you know, like family, friends or co-workers. Give them a text saying you're trying to make some extra cash, would they be interested in buying (item) for (amount) and cross your fingers! Failing that, put big items up for sale locally on bulletin boards and in shop windows or on local websites. Smaller things might do well on ebay. Alternatively do a bootsale or garage sale and advertise it as much as you can. (Cute little fliers with offers of tea and cake should bring the buyers in!)
Greetings cards: We all need cards at some point for birthdays, xmas, etc. Why not spend a day being all creative and making up boxes of mixed cards to sell? It can be pretty easy and inexpensive if you use what you've got lying round the house. Look in card shops or online for ideas.
Sewing: If you have a sewing machine (and some skills to go with it!) you can let it be known that you're the go-to-girl for clothes altering, mending and custom requests. I'm the only person in my little I.R.L world who does any sewing and I've been asked by various people to do sofa re-covering, bedroom cushions, personalised tote bags, patchwork blankets from out-grown baby clothes and even to make roman window blinds for one of my Mum's friends (which I had to decline as my skills aren't quite that good yet!) . Also:
Sell your crafts: Can you make dinosaur shaped cushions, knit a willy, paint kooky pictures or carve wood into snowflake shape? Probably not, heh. But if you happen to be able to make something that most regular people can't make and you can make it surprisingly well then you've probably got a little money-maker right there! List them on etsy, have your own stall at local craft fairs and fetes or make a big stock of stuff to sell near Xmas (Maybe throw a party and display your priced-up creations for guests to buy?). Brilliant advice can be found HERE and HERE.
Cleaning: Know any potential candidates for "How Clean Is Your House"? Offer to clean and tidy up their place yourself in exchange for some lovely cash. Get rid of them while you do it so you can unveil the transformation at the end, Kim and Aggie style!
Lunchboxes: If you make your own money-saving packed lunch, you could offer to do them for your work mates too and charge them enough to cover costs plus a little extra for the effort.
Events: Organise parties, day-trips to theme parks and other events for big groups of people (such as your friends, your whole family or a bunch of people from work). Add up your costs (venue, travel, accommodation, hire costs, etc.) and charge each person enough to cover them, plus extra. People will be happy to pay the extra if all the hard work is dealt with and they just have to turn up!
Shopping: You could get paid to do people's xmas shopping, their weekly food shop or go on a hunt for a specific thing they need- and other errands too. Ask local people who don't have the means or the time, like the elderly or "workaholics", if they need you.
Teaching: What are you good at? Spelling, reading, mathematics, spanish, sewing, cooking, hula-hooping, poker, tennis, dancing, HTML, knitting, playing the guitar? Charge by the hour for lessons! - Feel free to add more ideas in the comments below! xxx