Originally Posted by Schturman

You can try something...
1. Create a small pic and with name for example "folder-bg.png"
2. put this pic to:

Code:

/usr/share/themes/blanco/meegotouch/images/backgrounds

3. Now, open this file:

Code:

/usr/share/themes/base/meegotouch/meegotouchhome/style/meegotouchhome.css

to this block:

Code:

MWidgetStyle#folderContainerContentWidget {
    padding-left: 0;
    padding-right: 0;
    padding-top: $PADDING_MEDIUM;
    padding-bottom: $PADDING_MEDIUM;
    margin-left: 0;
    margin-right: 0;
    margin-top: 0;
    margin-bottom: 0;

    background-color: black;

4. change

Code:

background-color: black;

to

Code:

background-image: "folder-bg";

5. reboot your phone.

If you don't get reboot-loop -> post here a screenshot
If you will get reboot-loop -> reflash your phone.