Just download the MK picons from OpenVix, extract them on your desktop into a folder called picon - just the actual picons in the folder, no sub folders etc
Put the picon folder in the root of your VU+ hdd
Go to the EPG and press 'menu'
Change the 'Service Title Mode' to 'picon' or 'title and Picon'
I think that's it, works for me anyway. I've only been playing with the box for a couple of days and picking it up slowly so may have missed something