You could buy a basket to put all the goodies in, but to keep costs down try wrapping a fruit box from your local supermarket (the shallow sort that usually holds peaches, apples, etc) in wrapping paper.

Fill with shredded tissue paper and arrange the Easter eggs and chocolate to make it look really enticing.  Cover with clear cellophane and finish off with a bow. 

Consider having a second and third prize as well, such as a smaller hamper and a bag of mini eggs.  For schools, try and put together a hamper for each Year group so that the children feel they have a better chance of winning.  Sell raffle tickets in advance (usually about two weeks) and then draw shortly before Easter.