The OUV (German EAA) has hosted a design contest. A good read if you're considering designing your own aircraft, though there's a lot of variation in the quality of the reports.
I particularly like the #5 and #7 reports:
Design-Wettbewerb 2011/2012 « OUV – Oskar Ursinus Vereinigung
I particularly like the #5 and #7 reports:
Design-Wettbewerb 2011/2012 « OUV – Oskar Ursinus Vereinigung