We have other OS distributions that that live just fine on SD cards or sticks, already. If you want to bring computing to slums as a useful resource, the big problems are probably really:
1) actual hardware, shared or not, to run whatever open source OS you pick;
2) electricity to run the hardware and shelter for the hardware;
3) people to train those who have never used computers before, may have other literacy issues besides, and quite possibly speak dialects you will have difficulty getting localization for; and
4) affordable/free network access if these people want to use the internet.
I'll bet these are not the only issues, but if you don't address these, I suspect your money and time will be mostly wasted.
They only have one option that mentions immediately practical applications in its supporting information. That's the Technology skin, with the applications being easier crew identification, etc. Precisely the only reason why you would think they would invest the resources to play with pretty lights on the surface of a prototype, right now. The others are designs that might be nice to have someday, if there are large populations in these environments that might want to express individuality and creativity.
"Don't drop acid, take it pass-fail!" -- Bryan Michael Wendt