I created a Pinterest board with some logo examples that I like.
Although the majority of the logo's are in black and white, this is not a specific requirement for this contest, though it might help in the requirement to use the logo on both dark and light background by simply changing the logo color between black and white.
For the businesscard, we were thinking of printing it on alluminum (http://goo.gl/ytTXWA). Since our business is developing mobile apps, we would like to print an iPhone 6 on the alluminum card (double sided, full color), where the screen part contains the actual business card details. Please beware that when printing on alluminum the lightest color possible is the grey of the alluminum itself. White or transparency will end up leaving these parts of your design blank, thus unveiling the aluminum look.
Size of these businesscards must be 86mmx54mm + 3mm overflow on each side.
We will send the final print of the aluminum business card to the contest winner.