Designing interfaces and products is all about iterations and testing. Wireframing is a very important part of the process, it's about testing ideas very quickly and ideate. The last thing you should think about is the look and feel, but of course you don't want something terrible to show, especially when collaborating with other designers or clients. Basiliq - Freehand UI Kit provides a great solution for this problem. With over 300 beautiful crafted UI elements ready for your prototypes. Everyone loves high quality icons.