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scaledPreview = imagePreview->scaled(s, Qt::KeepAspectRatio, Qt::FastTransformation);
lw->setData(Qt::UserRole+1, QVariant(scaledPreview));

QByteArray ba = index.data(Qt::UserRole+1).toByteArray();

    QBuffer buffer(&ba);
    buffer.open(QIODevice::ReadWrite | QIODevice::Unbuffered);

    QImage *imagePreview = new QImage();
    imagePreview->load(&buffer, "PNG");

    QRect rect(QPoint(0,0), imagePreview->size());

    painter->drawImage(rect, *imagePreview);

lw->setData(Qt::DecorateRole, QVariant(scaledPreview));

lw->setData(Qt::UserRole+1, QVariant("TEST"));

    QString text = index.data(Qt::UserRole+1).toString();
    painter->drawText(myOption.rect, Qt::AlignCenter, text);

void QStyledItemDelegate::paint(QPainter *painter,
        const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    Q_ASSERT(index.isValid());

    QStyleOptionViewItemV4 opt = option;
    initStyleOption(&opt, index);

    ...
}

void PreviewTemplateDelegate::paint(QPainter *painter,
				    const QStyleOptionViewItem &option,
				    const QModelIndex &index) const
{
QStyleOptionViewItemV4 myOption = option;

initStyleOption(&myOption, index);

myOption.displayAlignment = Qt::AlignLeft | Qt::AlignBottom;

QString text = index.data(Qt::UserRole+1).toString();
painter->drawText(myOption.rect, Qt::AlignCenter, text);
}

QBrush ( const QPixmap & pixmap )
QBrush ( const QImage & image )

void PreviewTemplateDelegate::paint(QPainter *painter,
				    const QStyleOptionViewItem &option,
				    const QModelIndex &index) const
{
    Q_ASSERT(index.isValid());

    QBrush brush = index.data(Qt::BackgroundRole).value<QBrush>();
    QImage imagePreview = brush.textureImage();

    painter->drawImage(QPoint(0,0), imagePreview);

    QStyledItemDelegate::paint(painter, option, index);
}

QBrush background(scaledPreview);
lw->setData(Qt::BackgroundRole, QVariant(background));

QSize PreviewTemplateDelegate::sizeHint(const QStyleOptionViewItem &option,
					const QModelIndex &index) const
{
    Q_ASSERT(index.isValid());

    QBrush brush = index.data(Qt::BackgroundRole).value<QBrush>();

    QImage imagePreview = brush.textureImage();
    QSize s = imagePreview.size();

    return s;
}