there is a handy little app which does most of the work for you
look for it in the download section or something
anyway I done it without crossover and it was easy... make the pics up, find out what the correct size should be (640 x 480 I think), save them as .jpg
load up the app, name the skin... then you use the browse option and you to get your skin up (you can also have a launch skin).
then you can select your font colour and stuff like that
once you're done you can save the .ini file it created, now you put the .ini file and skin/s into the skin folder you unpacked from the evox zip, you will see the others there... you have to create a new folder inside the skin folder like the rest, name it correctly
use boxplorer... select D drive, find the folder you created which contains your skin, copy it onto the skin folder on your C drive
if you done it correctly you should be able to select it, if the original skin comes up that means you have names something wrong
I think the .ini file should be similar to this
skin folder is named bungle main skin is called bungle, launch skin is called loading (for example, name what you like)
main- ...skins/bungle/bungle
launch- ...skins/bungle/launch
hope this helps, it may sound confusing but it'll make a bit more sense once you have that application