Build something cool.
More about Build something cool.
Go to www.minecraft.net click on the free creative version. Load a world and build anything you think is cool. Take a screenshot "Shift + Prt scrn" Paste in paint of any other image editor and save. Then upload.
If you own minecraft you can build in that version as well. Lets see what people here can do in another world.
For vids use Fraps from www.fraps.com the free version will give you 30 sec recordings. They will be saved in the fraps folder under javaview.