I looked for quite a while, and I know that other people here did as well. Sorry that nobody has been able to find what you needed yet.
The only thing I can think of is this: Could you possibly find a tumblr user with a theme like you want, then ask them where they got it?
If you have never seen one like you want, then there may not be one yet. If you can find someone who is good with making layouts, perhaps they would do one up for you?
Search columnists here for a user named: "ThirdQED"
... He is SUPER at making layouts for other things... but I don't know if he would be interested in doing tumblr themes or not.
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