This is one way to increase the size of icons in Bootstrap 2.3. As I note in my comment, the results will be pretty poor because you are scaling the spritesheet image.
JSFiddle demo
.test {
background-image: url("http://twitter.github.io/bootstrap/assets/img/glyphicons-halflings.png");
width: 90px;
height: 90px;
background-size: 2100px 800px;
}
Consider Fontello instead. They allow you to generate a custom font based on the icons you choose.
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