The official line rider site, by inXile, has a free download of the Line Rider Screen Saver!! Its a free download but you have to register to get it.
Here’s what inXile says about the download:
Freeload,…er, …Free Download
The Line Rider Theater screen saver is offered as a free incentive (i.e. bribe) for you to tell us a bit about yourself by registering as an Official Line Rider Fan. If you are indeed a fan, or if you’re unscrupulous enough to impersonate one just to get some free “swag”, then read the information below and then click on the “Register Now” button at the bottom. Wait! Don’t just jump to the button or you’ll miss the bit below about how to win a Free Line Rider T-Shirt!
Oooooh, free T-Shirt possibility. Anyways, here’s the link to go straight to the download: The Line Rider Theater