How about "Eleven" themed songs (5 of them) which you can use as ringtones for today (don't listen to them - it is still Sefirat HaOmer!)
1. 11:11 by Rufus Wainwright
2. 11 O'Clock Tick Tock by U2
3. Song Eleven Could Take Forever by Ned's Atomic Dustbin
4. Eleven by Primus
5. The Eleven by The Grateful Dead
By the way, I use Audiko for all my ringtones. They have an app so I can just search for the song, and put it straight on my phone. No problem changing rintone every day (except for the obvious problem of not knowing whether it is my phone ringing or not, having forgotten the ringtone of today).