You are free to be super creative on this one!
The logo should probably include the words "Full Fat Things" within or near any graphical element that you may include.
When I think about a successful logo these words/phrases come to mind
high performance, speed, fun, machine, happy, positive, full fat
For the logo, all the work should be included within the price. I don't want to have to purchase any stock work to include in the log. I'd also like the logo in as high resolution psd/png or vector file as you can provide it in as I'd like to print it on banners for the office as well as use on the website.
A quick note on Full Fat. In the UK we refer to Full Fat Milk as the milk that has had no fat removed, or Full fat coke is Coca Cola (in a red can), not diet can. The idea of Full Fat Things is that you get the full, big fat fast version of what you want.
Please ask questions if you need clarification. Also I'll link to the winners web site from mine crediting the logo.
I am a fan of the following logo's out there..
I like the next one because it shows something like a process. i.e. factory producing demo's