first of all yes it's possible but you could have some minor trouble. Not all xbox's will read cd-r's. All of them will read a dvd-r. So if i were you i would write a folder named skins (containing all the skins) to the a dvd and then insert it into your xbox (make sure the disc is closed). Then access the file manager or boxplorer (app) and select the d:. You should then see your folder with your skins in it, you will have to manually move your skins to the correct folder. Depending on what dash you use. an example for avalaunch would be C:/media/skins It's easier to ftp these folders to your skins folder, but if you don't have a network setup i understand why you would want to write files to a disc instead. Let me know how it goes.
do by chance know where i could find a few since ur reply i been trying to find some good 1s that i would like but cant find none