If you are still interested in looking for someone to overall and set the design direction for your thumbnails, I would be more than interested in assisting. Will also throw in creating some templates for you within Photoshop. So that, if you had the program, you could cycle through and create a 'series' for the thumbnails themselves.
When I need some better design ideas, I use customthumbnails.com
I am NOT affiliated with them. Average price is $15 and I get the images and the PSD file, to
make minor changes myself. I think their work.