Hi @marketimpress,
Thank you for reaching out to us. You can use the Card element for that and add a background image to your card element with custom CSS. First give your card element a class e.g card-bg
(see screenshot below) then add the following code in the Theme Options > CSS:
.x-card-outercard-bg .x-face-outer.front .x-face-inner,
.x-card-outercard-bg .x-face-outer.back .x-face-inner {
background-position: 50% 50%;
background-repeat: no-repeat;
background-size: cover;
}
.x-card-outer.card-bg .x-face-outer.front .x-face-inner {
background-image: url('https://place-hold.it/300x1000');
}
.x-card-outer.card-bg .x-face-outer.back .x-face-inner {
background-image: url('https://place-hold.it/400x1200');
}
Just replace the background-image
URL in the above code for both sides of the card.

Hope this helps!