There are quite a few neat items available in the store to spend your hard earned Omicronian weed on after you finish the prize track.
There is one building, Big Ben, available for 500 weed:
Then there are quite a few decorations available:
The Free Popplers Mascot is available for 100 weed.
The Monument Beach Arch is available for 100 weed:
Finally, Orangutan Leela is available for 800 weed: