Need redesign some icons for our site.

Kind of design: Icon or button
Ideas for the visual style: Monochrome icons on #424242 background
Extra notes: Hello.
Need redesign some icons. It could be icons from internet, but i need certain color background and icon itself. Monochrome. Size is 100x100px. background color is #424242.

The icons is for site:
http://infraredsaunaguru.net/4-person-golden-indoor-cedar-infrared-sauna/
It would be optional features.
List of icons:

Chromotherapy
Ionizer
Lifetime warranty
Rain Cover.


Looking a designer for long time relationship )