Growing up, my mom would buy and wrap presents and put them under the tree before Christmas...I loved watching the gifts accumulate over the last few weeks before the holiday. Then, on Christmas morning, "Santa" would just leave the gifts out and displayed no wrapping. My mom's motto was always "Santa doesn't wrap!" Of course, that made it much easier to sneak out to the living room in the middle of the night to see what I got from Santa!
I think I'll do something similar with my kids. I definitely want some credit when it comes to giving gifts!