1. Covers
Covers, especially covers of songs that are popular, are a great way to demonstrate your chops and versatility. There are still plenty of big-name pop artists (especially in the pop-country world) that use high-level session players on their recordings; covering these tracks will allow you to bring views to your page, and help you see how first-call session players approach tracking their parts.
Of course, you don't have to just cover popular songs. Anything you like to play can be recorded for a YouTube cover. The key is that, whatever it is you record, record it with high-quality audio and video. The web is fairly saturated with low-quality bedroom covers, so it's important that you make yours as enjoyable to watch and listen to as possible.