Heyho,
If you have a phone which you can connect via USB to your computer (ie. Samsung d500 or sumthin) then go to Google images and type in Ibiza Sunsets, or stuff like Space logo, Pacha logo etc etc. Save the pics then transfer them onto ur fone via the USB cable then set them as ur Wallpaper!
Ive got loads of stuff this way!
However if you do not have a USB fone then alternatvley ask a friend and bluetooth them!