Nemesis has had a reputation for high-prim Christmas trees for some time, but I know that people don't necessarily have 40 or 50 prims free for their Christmas tree. On the other hand, crossed texture trees can look a bit artificial.
I have made a tree today which is pretty, and at only 8 prims is small enough for even 512 sq m parcel. I am experimenting with techniques, and wil be making more over the course of the week. There are some great freebies in the shop too!
bws
Cali
Edited - doh! - to add SLURL: http://slurl.com/secondlife/Nemesis/128/127/29/