A letter telling your parents of all the things you are grateful for. Make breakfast for them, or in the evening, cook a nice meal and set up a table outside with candles. Get them two movie tickets or tickets to a concert or play that they would like to watch.
A lot of us wonder if giving someone a gift is really worth the hassle; isn't it enough to just give them a greeting card? While that sounds like a logical argument, the idea of giving someone a gift goes beyond the act of spending. It's about taking time out from a busy schedule to select a gift specially for someone, choosing something after careful consideration.