how about designing something to fit in cup holder to keep drinks upright, number of times i have went round a bend and drink has nearly fell out cos there is only half an inch of the cup actually in holder which isnt good if its a full cup of coffee to start my journey off with.
just an idea cos i could really do with one lol
hmmmmmmmmmmmmmmmm or could design a coffee machine that fits in there lol (cos i always end up forgetting mines there and go to drink it when its cold

and cant be bothered to stop to get another one.