Today we put up the Christmas decorations in the house. After a while I had this odd thought creep into my head: "why not have LEDs on a tree on the railway?". A short time later and I had 5 LEDs plus some resistors soldered together and wrapped round a small conifer on the railway layout near the station entrance.
They're surprisingly bright. Unfortunately I only had orange, yellow, and red LEDs left in the small size, would have liked to put a green one in too. Maybe next year ...