We are undergoing a UI overhaul and need a set of GUI icons designed in this style: http://www.aiga.org/content.cfm/symbol-signs (like the international airport symbols; take a look at our logo to see an example).
Ideally the icons are monochrome (like the above style) so that the color can be easily changed to our palette, but they do not have to be black/white. To get you started, our logo blue is #00a5d5.
The challenge is to design a 3 small basic icons: add, remove, and pie chart; as well as 3 conceptual icons: import a credit card, install mobile app, and attach a receipt.
The icons should look good at these sizes:
add/remove and attach a receipt: 16x16 and 13x13 px
pie chart: 25x25px
import cc and install mobile app: 25x25 to 150x150 (depends on what you come up with).
If you get chosen we will contact you to design the full set.