In Nokia phones you can change your icons,screensavers etc with themes. e.g 6233...bla bla
In Sony ericsson, NO Way with themes even in latest phones(current). may be later sony think about these facilities.......(e.g 16m screen, 3.5mm Jack, stereo 3d sound, DvD quality recording && efficient softwares which gives many facilities without symbion OS. because i hate viruses. and i don't want to buy any antivirus 4 mobiles, if some one hav latest, give me free.
well, with customization you can change your icons, some times its risky... if you are beginner.