I recently took a guild seminar on dealing with panels. The lady who taught the seminar was a wiz with panels! One of the things she did was spend time with each of us to get some ideas on our problem panel projects. I don't usually work with panels and just don't understand why they can/are designed deliberately skewed. I quickly found out last year that although my panel blocks looked the same and square they weren't at all!
One thing she talked about was trying to pick up design cues from the fabric. For me, trying to enlarge what you have is I would probably have the large panel in the middle, with two panels above and two panels down -- and I'd piece a wood fence between the large and small panels and probably around the outside. I'd keep the rest pretty green and blendy. To make it quite a bit larger I'd look at large panel in the middle and small panels as corner.
I think you could also do some shadow type black thin borders/sashing if you used the borders on the blocks.
For my current Bonnie Hunter project I decided to go Monochrome -- black, gray, and white -- or as I call it "sheep colors"!
Regarding eQuilters, that was one of my first places to look. Unfortunately to save space they only keep up a couple of years of the free designs which are mostly to celebrate particular lines of fabric and after all this time the designs do not seem very varied any more
