Ideas for minecraft?

Throughout the day all kinds of fun things to build in minecraft pop up in my mind. On our own private server I keep a whole list of "things to do", for I have so many ideas and I can't decide which one to do next. I'll share you my to do list, maybe there is something you like.

-1 to 1 pickaxe model. Not new, but okay.
-A pyramid. Maybe one of those Aztec models, they are sort of more detailed than the Egyptian ones
-A skyscraper. A really tall one.
-A small house. For a change, something that isn't huge.
-The tower bridge, complete with walkways for pedestrians and minecarts for the road.
-A 1 to 1 chest model. Could act as a bank of sorts.
-The Euromast.
-A fully automated train station. (My current project, quite complicated.)
-A library. We have book shelves, but more bookshelves in a central building would be nice.
-An arena. Just started on this one, it's oval and inspired by the Colloseum in Rome. It's 142 by 87 blocks, really massive.
-An automated bank. Complicated but very nice. Inspired by this German vid:
http://www.youtube.com/watch?v=JlGLDF2dk2I
-A cathedral. Nothing too special, but I think I'll build it after the Notre Dame in Bayeux.
-An aircraft carrier. Just finished this one, I could show pictures if you want to.
-A submarine. Since I had the carrier, I decided I wanted a sub too.
-A generic castle. Nothing unique, but every server needs at least one.
-A hotel. Was halfway on this when our admin decided we had to move it away.
-A dock. You know, for boats.
-A 1 to 1 spider model. Difficult, but not out of the ballpark.
-A nintendo DS. Since I saw the PSP on Minecraft's main site, I thought a DS wouldn't be too difficult. A little more difficult than the regular PSP though.

that 3rd one....... post a vid if u get that to work