1- set the list viewMode to IconMode
2- add your icons in a ressource
3- for each icon, create a pixmap, an item and use setData(Qt::DecorationRole, pixmap) to set the icon in the item;
4- add the item to the list

Make sure to use the ":" instead of "qrc:" when referring to an icon. For example, use ":/Icons48x48/add.ico" instead of "qrc:/Icons48x48/add.ico". I don't know why but using "qrc" does not work for me !

void MainWindow::setupList()
{
    setMenuIcon(":/Icons48x48/help.ico", "Help");
    setMenuIcon(":/Icons48x48/add.ico", "More");
}

void MainWindow::setMenuIcon(QString pixmapName, QString text)
{
    QPixmap pixmap(pixmapName);
    QListWidgetItem* item = new QListWidgetItem(pixmap, text);
    item->setData(Qt::DecorationRole, pixmap);
    ui->lwIconsMenu->addItem(item);
}

Max2G