Depends what you are fundraising for.
Cake Sale - have done these for school, for children's centre and for Bliss Premature Baby Charity. Always very popular.
Marshmallow kebabs always seem to be a good seller. Three marshmallows and a couple of grapes on a stick for 50p.
Memory Tree/Wish tree - sell a gift tag for 50p so people can write a special message or name on them or write a wish on them. Hang them on the tree, keep it on display for a week or so.
Balloon tombola - people donate the prizes, number each prize and put a corresponding number in an inflated balloon. Pay £1 to pop a balloon, win the prize whose number is inside it.
String pull bottle raffle - you have a selection of bottles, anything from alcohol to water to fruit shoots, all with a long string tied to them. Have the bottles on a table with a big board in front of them. Thread the strings over the top of the board and through a cardboard tube attached to the board. Pay £1 to select and pull one string, win the bottle attached to it.
Lucky dip - always seems to be popular if you can get lots of little gift items in paper bags, just need a big box and lots of shredded paper to put them in.
Sponge throwing - especially popular at school fundraises if the teachers will be targets. Head teacher especially seems to be a popular target.
Guess the bear's birthday - you just need a small bear and a calendar and get people to pay 20p a date to write their name and phone number on the date they think is his birthday. Pick a birthday out of a hat once all the squares are filled or your event is over. Small bears seem more popular with parents than giant ones, although once we raffled the same giant tiger about four or five times before someone actually claimed him 