Recreating the SIRI icon with no images or javascript. Four HTML elements have been used so far and the CSS is very messy. I hope to clean this up in the future. This will be an on-going build.

index.html

<link rel="stylesheet" type="text/css" href="http://fonts.googleapis.com/css?family=Source+Code+Pro:200,300" media="screen">
<div id="siri">
  <div id="spin"></div>
  <a id="icon">
    	<span class="highlights"></span>
    </a>
</div>

style.sass

@import "compass"
*     { padding: 0px; margin: 0; }
html  { height: 100%; background: #111; }

#siri {
  display: block;
  position: relative;
  width: 140px;
  height: 140px;
  border-radius: 100%;
  margin: 60px auto;
  overflow: hidden;
  box-shadow: 0 0 0 5px rgba(200, 200, 200, 1);
  &:after {
    content: '';
    display: block;
    position: absolute;
    height: 130px;
    width: 130px;
    border-radius: 100%;
    left: 5px;
    top: 5px;
    background: #c8c8c8;
  }
}

#spin	{ 
  display: block;
  overflow: hidden;
  position: absolute;
  z-index: 0;
  margin: 0 auto;
  top: 0;
  left: 0;
  height: 140px;
  width: 140px;
  border-radius: 100%;
  @include background(
    linear-gradient(150deg, #E288E7 20%, transparent 60%),
    linear-gradient(45deg, white 60%, transparent 60%)
  );
  @include animation(rotation 5s infinite);
}

@-webkit-keyframes rotation {
  from {
    -webkit-transform: rotate(0deg);
    -webkit-animation-timing-function: linear;
  }
  to {
    -webkit-transform: rotate(360deg);
  }
}

#home {
  &:after	{ 
    height: 270px;
    width: 270px;
    border-radius: 100%;
    left: 4px;
    top: 4px;
    box-shadow: 0 2px 5px 4px rgba(0, 0, 0, 0.2);
    @include background(
      radial-gradient(23% 79%, 7% 7%, #222 50%, #1e1e1e 95%, rgba(0, 0, 0, 0.1) 90%, transparent 100%),
      radial-gradient(30% 40%, #282828 20%, #222 60%)
    );
  }
}

.highlights	{
  height: 66px;
  width: 32px;
  display: block;
  left: 3px;
  top: 3px;
  @include border-radius(20px);
  background-image:-webkit-gradient(linear, 68% 37%, 64% 36%, from(transparent), to(rgba(255,255,255,0.4)));
}

#icon { 
  height: 66px;
  width: 32px;
  @include border-radius(20px);
  display: block;
  top: 16%;
  margin: 0 auto;
  z-index: 1;
  position: relative;
  font-family: 'Source Code Pro', sans-serif;
  background-size: 5px 10px;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.1),
    0 0 0 2px #312042,
    0 0 0 3px #000;
  @include background(
    radial-gradient(circle, #491d55 0px, transparent 4px),
    radial-gradient(circle, #491d55 0px, transparent 4px) 3px 5px,
    #291352
  );
}

#icon {
  &:hover	{
    @include background(
      radial-gradient(circle, rgba(255,208,255, 0.8) 2px, transparent 4px),
      radial-gradient(circle, rgba(255,208,255, 0.8) 2px, transparent 4px) 5px 2px,
      #8046EF
    );
    background-size: 10px 5px;
  }
  
  &:before{
    content: 'U';
    display: block;
    position: absolute;
    font-weight: 200;
    font-size: 9em;
    line-height: 0.01em;
    height: 146px;
    margin: -30px 0 0 0;
    top: 55px;
    left: -27px;
    background:
      -webkit-gradient(linear, left top, 50% 40%, from(#101010), to(#2f2f2f), color-stop(0.6,#575757)),
      #fff;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }
  
  &:after{
    content: 'T';
    display: block;
    position: absolute;
    font-weight: 300;
    font-size: 9em;
    line-height: 0.61em;
    height: 25px;
    width: 32px;
    top: 76px;
    left: 0px;
    text-indent: -27px;
    background: -webkit-gradient(linear, left top, 60% 20%, from(#1b1b1b), to(#333));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    -webkit-transform: rotate(180deg);
    border-top: 1px solid rgba(255, 255, 255, 0.3);
  }
}