It might help to take a step back and look at your video creation process. When producing videos, a number of things end up 'on the cutting room floor' such as bad takes or mistakes. These can be packaged into their own videos. Bloopers and mistakes are often interesting to those who are already fans of your work. It doesn't take much effort to make these available to those who want them. This way, you can either use them as lures to help Connect With Fans or you can use them as a revenue source such as selling the blooper reel for a small amount of money to give fans a Reason To Buy.
Similarly, taking your videos, which are likely pitched in simple, straightforward, and professional tones, and producing ancillary videos that alter those characteristics. Have you main line of videos, but take a video and produce a musical version through AutoTune or make a Rap video or change the language to Klingon or anythign that interests the geekier side of you. Maybe make fan videos using the audio from your video but replace the video portion with Batman or My Little Pony. Then, these 'Alternate' videos become, with only an incremental increase in effort, a new line of 'product' that can be used to grow your fan base.
One can tweak your main videos in some way. Incorporate something odd in the background. Maybe get some Bucky Balls (strong, small magnetic spheres) and create art in the background or have a mascot. Never refer to them, but challenge the viewers to find it in each video.