Hitachi vibrator make your own?

my fiance and i have had the corded hitachi. we seen the pillow things. is there a site or someone blog about how to make your own pillow holder attachment. we were just thinking we could make something with foam and fabric. dont really want to shell out insane cash for foam and fabric/vinyl, when we could make it ourselves. any thing would help. websites prefered... thanks for your efforts my fiances "bean" appreciates it... or any other fun things to do with hitachi in bed would be fun too. open to suggestions here. not saying the toy is getting boring. its just so fun to use... besides the fact that it gets piping hot after a bit.. (any tips on that? to prevent overheating.. would be helpful too! thank you community for your efforts and imagination!