I found a fun, cheap, and easy project in Family Fun magazine about making Lava Lamps with things you already have in your house. You will need 3 empty water bottles ( I don't normally buy this kind of water,.
Use card stock and misc buttons to make your own Christmas cards. The card stock can be bought at Walmart, etc. or at most any craft store. The buttons come in bags at most craft, hobby, or fabric stores.