Dringend and Build Server icons

These are the icons I made for the iOS app I'm releasing soon, Dringend (http://dringend.cc), which is a development environment on the iPad. It requires a companion app on the Mac for building & running so I quickly came up with the build server icon using similar colors and style to the iOS icon.

I'm a developer at heart and not a brilliant designer, so please don't be too critical :)