AI want to do car cake for my husband and I want to do the heads lights glass affect is there any way this can be done?

Gelatin?

A[LIST] Depending on how big you need them, you could make them out of hard candy (either make it yourself or buy the color candies you want - yellow perhaps? - and melt down. Then simply pour into an appropriately shaped candy mold. If you don't want to mess with hot sugar, I've made fondant cut outs, painted them with pearl dust and then coated them with Light corn syrup and allowed to dry. Good luck! [/LIST]