That would be fantastic! I wouldn't even know how to make a start, but if you're au fait with such things and want to produce something, by all means go ahead.
As John Marwood hinted at earlier in the thread, I am working on a new style, so you might want to wait until that is unveiled, otherwise your instructional videos won't match the default Forum skin.
For those of you who don't like change: Don't worry, it's just a re-colour of the existing style, in a less brash, more laid back colour scheme. All the functionality will remain the same (i.e. buttons in the same place, etc.), but everything will be less white! And even if you don't like it, this one you're using right now will remain as an option, and be supported in tandem with the new one (since, as I say, they're essentially the same style just with different colours).