I started playing Ticket To Ride, and find it a fantastic board game!
I did find it a bit difficult, however, to hold all the train cards and tickets at the same time, as they can become high in number,so I thought I'd design a card holder for the tickets,to be able to look at them throughout the game.
The holder can also be used for the score summary card, or any card actually...
I printed the sample ones with a single-extruder printer, changing filament color a few times to give the finished result a nicer, multi-colored appearance.
The holder looks very nice in monochrome as well, another neat idea could be printing a few (5 or 6 per player for 2-player games) in the same color as the trains and stations.
Hope this is useful! :)