My little boy is turning 5, need ideas for birthday?

my little boy is turning 5 in the end of july. he is autistic and doesn't like the "normal" 5 yr old stuff like cars and things. hes into more like anything that catches his eye like wind chimes or anything that shines. if u have a autistic child you know what i am talking about. his attention span is NOT long at all. But i would like some ideas on a birthday theme (ANYTHING BRIGHT) we've done spongebob (which he loves but i am SICK of), dinosaurs, and well i guess that's it. If anyone has any ideas on a themes or just some fun little games to play please let me know even if your child isn't autistic. THANKS!