My desktop is very messy, lots of sd cards, cables and usb things like sd readers, bt dongles, etc so I extended a sd card holder I found here.

This is a extensible holder for your desktop that holds 8 normal sd card, 11 microsd and up to 5 usb 'things' like pendrives.

This is the third build I made, I was adjusting the microsd card slot :D in the photo you can see the modifications from older (left) to newer