The Noun Project is a free, online symbol library of the world's visual language that can be understood by all cultures and all people. thenounproject.com via 3oneseven #The_Noun_Project
Here are some simple icon designs. I like how easy clean they are and each one has a specific opening to it that allows the icon to be a part of the background. I also like how they are all see through and tie in well the background also.