YouTube thumbnails - options for adjusting interface widgets and behaviour when clicked? I wish to add YouTube videos to my site as links - I want to use a thumbnail of the video. I'm not concerned with which thumbnail used (as discussed here: How to control preview image in Youtube)

What I am concerned with is how the play etc. buttons look on a thumbnail (i.e. everything reduced in size from how it would appear in YouTube).

What options do YouTube themselves offer? And what about 3rd-party solutions?

Facebook for example does this quite well - the thumbnail is not too cluttered and will expand when clicked onto to a usable size to view the video at a reasonable size on the same page (an example of my requirement for behaviour when clicked).

Any examples of such customisations on Drupal sites, please? Thanks in advance :)
I recommend the Video Embed Field module, it's pretty new but under active development. It will just show the thumbnail and when you click it load the video player page.

However, they are working on a lightbox integration (video plays in a popup modal) and you might want to suggest the "Facebook player functionality" as a new feature to them.