How about...
(On the front) Support the Society for the Prevention of Cruelty to Aspies
(On the back) Quit staring at me/quit touching me/quit using facial expressions/quit using metaphors etc.
Where I come from (or 'on my planet'), making eye contact is staring. On your planet, it's rude to stare. Geddit?
Aspergers: Stim-a-rific!
Autism: (picture of buttons etc lined up according to colour/size/shape) Make Sense?
(Picture of Autism puzzle ribbon) OMG THEY GOT THE COLOURS IN THE WRONG ORDER!! !
Aspies: Intelligent, Intense and stimming like all hell broke loose!
I socialise: it's not my fault that you don't wanna hear about (insert perseveration here).
Wanna come and stim at my place after school?
I'm an Autie... AND I WANT MY RAINBOW BACK!
Flapping: the new chicken dance
Flapping: good for the circulation
Cure Asperger's: get rid of NT's!
Spot the Aspie: (pic of crowd of black stick figures standing up with one rainbow figure sitting off to the side, flapping)
And this one would take a LOT of courage and a LOT of explaining and cause a LOT of confusion:
(picture of rainbow) I'm Autistic, and I'm LITERALLY gay! (gay meaning happy, rainbow being associated with homosexuality and Autism)
I know they are all very stereotypical, but the idea of them makes me giggle!
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...though fire may burn & flames envelop me, I will arise from the ashes...