Icon Design x 4

I need 4 icons designed; the icons must be in vector format (preferably Illustrator) so they can be resized. The icons must have the look and feel of our website (frontpage screenshot attached). I have provided 4 sample icons that I am wanting to replace; they are simple letters "a", "o", "s" and "r". You can either use the same letters in the icon design or keep the same colour scheme - or both. The icons must however be original (i.e. not downloaded from a stock image site) - I will be looking to see if the icons have the look and feel of our website. Please provide a low-res sample in your bid, or, examples of similar work you have done. I have further work needing to be done, so if this project goes well, you can expect more work to immediately follow.