Here is a piece I've spent far too much time on. (Select Cloud Battle (WIP) to play, sorry, I don't have any dedicated hosting for mp3s.)
It's a remix of "GET IT BY YOUR HANDS" by Hiroshi Watanabe from the Eureka Seven soundtrack.
I spent probably a week or two playing and arranging and a few months getting to actually sound right.
I've never been too happy with it, but I've finally polished it enough to where I can get feedback for it from other sources.
I still have a few more things I'm going to add (some classical instruments maybe), but I thought I'd get some advice before I move to the next stage