What is a great way to show your appreciation for someone?

I tell people often, probably driving them nuts.

I also send cards, or flowers, or cook/bake something tasty.  Who doesn't like a box of homemade cookies?  Oh, and I've made some cool Rice Krispie Treat sculptures.

I used to send little gifts, cards, text with flowers, cupcakes and candy.

I send them 8X10 glossy nude photos of me. Most of them come back "return to sender". I guess they have no appreciation of the human anatomy.

Depending on what they did, anywhere from a heartfelt thank you, to a hand written note, to a homemade dessert, to a gift card to their favorite restaurant.

For me it is a personal heatfilled "thank You.

A thank you a card a i appreciate it

Buy them an Xbox 360

I still like to write and mail thank you notes.  I find it easier to express myself that way.