Hi tocadaweb
Icons are called from css file and they are stored in this image /templates/ja_onepage/images/intro-icons.png
You can modify that png to add your icons
custom module showing them is structured in this way
<div class="block-img">
<i class="introducing-icon1"> </i>
</div>
If you want to add new images icons then add to your custom.css
.introducing .block-img-1 {
background-image:url(../images/youricon.png)
}
and change in your module
<div class="block-img">
with
<div class="block-img-1">
Hope it helps