The tribute that springs to mind best first is Pogo’s Data and Picard: a beautiful track made from Stewart performing as Picard.

Now cheer up me lads, t’is better to have loved and lost, than never have loved at all.

https://www.youtube.com/watch?v=AZn6c4CeJCc [The one on Pogo’s channel doesn’t include clips of Stewart, just his voice. This is a reupload of the original]