I have seen that you can load bigger files in but you can also load the pics as jpg's if you want, loading bigger pics is going to limit how many you can put on keep that in mind when making wallpapers and you can convert your wav ringtones to mp3 tones and cut the file size down too making it possible to put more on as well. If you don't have it allready go to
www.dbpoweramp.com and download the converter you can make any audio file any other type of file you want very handy program to have for making ringtones the right file type.